libc: Cleanup SCC headers

Only leave the parts relevant to the Trusted Firmware.

Change-Id: I0444c16e402f6c1629211d03bf6cb32ca3dbcf59
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/include/lib/libc/limits.h b/include/lib/libc/limits.h
index f6a4c7b..41bb658 100644
--- a/include/lib/libc/limits.h
+++ b/include/lib/libc/limits.h
@@ -8,12 +8,12 @@
  * All rights reserved.
  */
 
-#ifndef _LIMITS_H
-#define _LIMITS_H
+#ifndef LIMITS_H
+#define LIMITS_H
 
 #include <limits_.h>
 
 #define CHAR_BIT   8
 #define MB_LEN_MAX 1
 
-#endif
+#endif /* LIMITS_H */