boards/xtensa/esp32s3/esp32s3-xiao: re-enable nxinit, with a working console

This restores the entrypoint switch from commit
7cc6707a76 ("boards/esp32s3-xiao: switch
defconfigs to nxinit entrypoint"), reverted in 76b90e02cbe4967193
b620abcb1efb9f6b3f8f5b after a real-hardware regression report on
Seeed XIAO ESP32-S3 (board hangs, no USB console), and fixes the
actual root cause this time instead of just reverting it.

Root cause: the shared boards/xtensa/esp32s3 init.rc starts the
interactive console as a plain "sh", which, unlike nsh_main's
nsh_consolemain(), never registers/connects the CDC-ACM gadget this
board uses as its console (CONFIG_CDCACM_CONSOLE=y, no
CONFIG_DEV_CONSOLE). Restoring the previous commit's entrypoint switch
on its own is therefore not sufficient - it would just reintroduce the
same regression, so that commit is folded into this one rather than
kept as a separate, individually broken step.

Fix, using the "console" service option added to nxinit by a companion
apps change:

- init.rc: bring up the console gadget once, unconditionally, before
  any service starts, via "exec -- sercon" (apps/system/cdcacm already
  implements exactly this and depends on neither nxinit nor nsh); flag
  the "console" service with the new "console" option so its stdio is
  connected to the (now registered) gadget device.
- esp32s3-xiao's usbnsh/combo defconfigs: add CONFIG_SYSTEM_CDCACM=y so
  sercon is actually built in. Verified with "make savedefconfig"
  against both defconfigs (byte-identical, no manual edits beyond the
  generated diff).

Verified end to end on real Seeed XIAO ESP32-S3 Sense hardware
(usbnsh): after this change the board enumerates its NuttX CDC-ACM
gadget on a normal reset and boots to an interactive nsh session
spawned by nxinit ("ps" shows init_main as PID 2, parent of "sh").

Assisted-by: Kiro:claude-sonnet-5
Signed-off-by: wangjianyu3 <wangjianyu3@xiaomi.com>

boards/xtensa/esp32s3/common/src/etc/init.d/init.rc

@@ -24,6 +24,7 @@
 
 #ifdef CONFIG_SYSTEM_NSH
 service console sh
+   console
    restart_period 1000
 #endif
 
@@ -36,6 +37,9 @@ service fastbootd fastbootd
 #endif
 
 on init
+#ifdef CONFIG_SYSTEM_CDCACM
+   exec -- sercon
+#endif
 #ifdef CONFIG_SYSTEM_NSH
    start console
 #endif

boards/xtensa/esp32s3/esp32s3-xiao/configs/combo/defconfig

@@ -22,7 +22,6 @@ CONFIG_ARCH_MINIMAL_VECTORTABLE_DYNAMIC=y
 CONFIG_ARCH_NUSER_INTERRUPTS=2
 CONFIG_ARCH_STACKDUMP=y
 CONFIG_ARCH_XTENSA=y
-CONFIG_BOARDCTL_USBDEVCTRL=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
@@ -33,15 +32,19 @@ CONFIG_DEV_GPIO=y
 CONFIG_ESP32S3_GPIO_IRQ=y
 CONFIG_ESP32S3_OTG=y
 CONFIG_ESP32S3_UART0=y
+CONFIG_ETC_ROMFS=y
 CONFIG_EXAMPLES_GPIO=y
 CONFIG_EXAMPLES_LEDS=y
+CONFIG_EXPERIMENTAL=y
 CONFIG_FS_PROCFS=y
+CONFIG_FS_ROMFS=y
 CONFIG_HAVE_CXX=y
 CONFIG_HAVE_CXXINITIALIZE=y
 CONFIG_IDLETHREAD_STACKSIZE=3072
-CONFIG_INIT_ENTRYPOINT="nsh_main"
-CONFIG_INIT_STACKSIZE=4096
+CONFIG_INIT_ENTRYPOINT="init_main"
+CONFIG_INIT_STACKSIZE=8192
 CONFIG_INTELHEX_BINARY=y
+CONFIG_LIBC_EXECFUNCS=y
 CONFIG_LINE_MAX=64
 CONFIG_NSH_BUILTIN_APPS=y
 CONFIG_NSH_FILEIOSIZE=512
@@ -50,11 +53,16 @@ CONFIG_PREALLOC_TIMERS=4
 CONFIG_RAM_SIZE=114688
 CONFIG_RAM_START=0x20000000
 CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_CHILD_STATUS=y
+CONFIG_SCHED_HAVE_PARENT=y
 CONFIG_SCHED_WAITPID=y
 CONFIG_START_DAY=6
 CONFIG_START_MONTH=12
 CONFIG_START_YEAR=2011
 CONFIG_SYSLOG_BUFFER=y
+CONFIG_SYSTEM_CDCACM=y
 CONFIG_SYSTEM_NSH=y
+CONFIG_SYSTEM_NSH_STACKSIZE=8192
+CONFIG_SYSTEM_NXINIT=y
 CONFIG_USERLED=y
 CONFIG_USERLED_LOWER=y

boards/xtensa/esp32s3/esp32s3-xiao/configs/usbnsh/defconfig

@@ -21,7 +21,6 @@ CONFIG_ARCH_MINIMAL_VECTORTABLE_DYNAMIC=y
 CONFIG_ARCH_NUSER_INTERRUPTS=2
 CONFIG_ARCH_STACKDUMP=y
 CONFIG_ARCH_XTENSA=y
-CONFIG_BOARDCTL_USBDEVCTRL=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
@@ -30,13 +29,17 @@ CONFIG_DEBUG_FULLOPT=y
 CONFIG_DEBUG_SYMBOLS=y
 CONFIG_ESP32S3_OTG=y
 CONFIG_ESP32S3_UART0=y
+CONFIG_ETC_ROMFS=y
+CONFIG_EXPERIMENTAL=y
 CONFIG_FS_PROCFS=y
+CONFIG_FS_ROMFS=y
 CONFIG_HAVE_CXX=y
 CONFIG_HAVE_CXXINITIALIZE=y
 CONFIG_IDLETHREAD_STACKSIZE=3072
-CONFIG_INIT_ENTRYPOINT="nsh_main"
-CONFIG_INIT_STACKSIZE=4096
+CONFIG_INIT_ENTRYPOINT="init_main"
+CONFIG_INIT_STACKSIZE=8192
 CONFIG_INTELHEX_BINARY=y
+CONFIG_LIBC_EXECFUNCS=y
 CONFIG_LINE_MAX=64
 CONFIG_NSH_BUILTIN_APPS=y
 CONFIG_NSH_FILEIOSIZE=512
@@ -45,9 +48,14 @@ CONFIG_PREALLOC_TIMERS=4
 CONFIG_RAM_SIZE=114688
 CONFIG_RAM_START=0x20000000
 CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_CHILD_STATUS=y
+CONFIG_SCHED_HAVE_PARENT=y
 CONFIG_SCHED_WAITPID=y
 CONFIG_START_DAY=6
 CONFIG_START_MONTH=12
 CONFIG_START_YEAR=2011
 CONFIG_SYSLOG_BUFFER=y
+CONFIG_SYSTEM_CDCACM=y
 CONFIG_SYSTEM_NSH=y
+CONFIG_SYSTEM_NSH_STACKSIZE=8192
+CONFIG_SYSTEM_NXINIT=y