boards/qemu-armv8a: Fix location of kasan.shadows

The location of the kasan.shadows section was causing mysterious CI
issues.

Signed-off-by: Matteo Golin <matteo.golin@gmail.com>

boards/arm64/qemu/qemu-armv8a/scripts/dramboot.ld

@@ -45,9 +45,6 @@ SECTIONS
     KEEP (*(.data..LASAN0))
     KEEP (*(.data.rel.local..LASAN0))
   }
-  .kasan.shadows : {
-    *(.kasan.shadows)
-  }
 #endif
 
   _start = .;
@@ -128,6 +125,13 @@ SECTIONS
   _ebss = .;
   _szbss = _ebss - _sbss;
 
+#ifdef CONFIG_MM_KASAN_GLOBAL
+  .kasan.shadows : {
+    KEEP(*(.kasan.shadows))
+  } :text
+  . = ALIGN(4096);
+#endif
+
   .initstack : {             /* INIT STACK */
        _s_initstack = .;
        *(.initstack)