stdio.h:Remove unnecessary header file, app header change

stdio.h remove <nuttx/xxxx.h>  Some .c previously depended on
<nuttx/xxx.h> and needed to be added to .c instead of stdio.h

Signed-off-by: anjiahao <anjiahao@xiaomi.com>

testing/ostest/nxevent.c

@@ -26,6 +26,7 @@
 #include <nuttx/event.h>
 
 #include <stdio.h>
+#include <sched.h>
 #include <pthread.h>
 
 #include "ostest.h"

testing/ostest/pthread_exit.c

@@ -25,6 +25,7 @@
 #include <nuttx/config.h>
 #include <sys/wait.h>
 #include <stdio.h>
+#include <sched.h>
 #include <stdlib.h>
 #include <pthread.h>
 #include <unistd.h>

testing/ostest/setjmp.c

@@ -27,6 +27,7 @@
 #include <assert.h>
 #include <setjmp.h>
 #include <stdio.h>
+#include <stdbool.h>
 
 /****************************************************************************
  * Public Functions

testing/ostest/setvbuf.c

@@ -26,6 +26,7 @@
 
 #include <assert.h>
 #include <stdio.h>
+#include <stdbool.h>
 
 #ifndef CONFIG_STDIO_DISABLE_BUFFERING
 

testing/ostest/signest.c

@@ -32,6 +32,7 @@
 #include <signal.h>
 #include <stdbool.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <unistd.h>
 #include <debug.h>