fix a typo

Signed-off-by: hujun5 <[email protected]>

Author: hujun260

libs/libc/machine/arch_atomic.c

@@ -32,7 +32,7 @@
 #include <nuttx/macro.h>
 
 /****************************************************************************
- * Pivate Data
+ * Private Data
  ****************************************************************************/
 
 static spinlock_t g_atomic_lock = SP_UNLOCKED;