libc: Fix all includes in codebase

The codebase was using non-standard headers. It is needed to replace
them by the correct ones so that we can use the new libc headers.

Change-Id: I530f71d9510cb036e69fe79823c8230afe890b9d
Acked-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/include/lib/aarch32/arch_helpers.h b/include/lib/aarch32/arch_helpers.h
index aa68bcb..8eda5cb 100644
--- a/include/lib/aarch32/arch_helpers.h
+++ b/include/lib/aarch32/arch_helpers.h
@@ -8,8 +8,9 @@
 #define __ARCH_HELPERS_H__
 
 #include <arch.h>	/* for additional register definitions */
+#include <cdefs.h>
 #include <stdint.h>
-#include <sys/types.h>
+#include <string.h>
 
 /**********************************************************************
  * Macros which create inline functions to read or write CPU system