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/utils.h b/include/lib/utils.h
index 5f13e99..09ec8d9 100644
--- a/include/lib/utils.h
+++ b/include/lib/utils.h
@@ -17,7 +17,7 @@
  */
 #if !(defined(__LINKER__) || defined(__ASSEMBLY__))
 
-#include <types.h>
+#include <stdint.h>
 
 typedef struct mem_region {
 	uintptr_t base;