sched/posixspawn: disable tedious logging

This log appears for NSH internal commands in KERNEL build and
duplicates a lot with task_spawn: log. So drop it to make the
DEBUG_SCHED_INFO logging more readable.

Signed-off-by: Yanfeng Liu <yfliu2008@qq.com>

sched/task/task_posixspawn.c

@@ -218,9 +218,6 @@ int posix_spawn(FAR pid_t *pid, FAR const char *path,
                 FAR const posix_spawnattr_t *attr,
                 FAR char * const argv[], FAR char * const envp[])
 {
-  sinfo("pid=%p path=%s file_actions=%p attr=%p argv=%p\n",
-        pid, path, file_actions, attr, argv);
-
   return nxposix_spawn_exec(pid, path,
                             file_actions != NULL ?
                             *file_actions : NULL, attr, argv, envp);