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/plat/socionext/uniphier/uniphier.h b/plat/socionext/uniphier/uniphier.h
index 1768e3b..7ff1464 100644
--- a/plat/socionext/uniphier/uniphier.h
+++ b/plat/socionext/uniphier/uniphier.h
@@ -8,7 +8,7 @@
 #define __UNIPHIER_H__
 
 #include <stdint.h>
-#include <types.h>
+#include <string.h>
 
 unsigned int uniphier_get_soc_type(void);
 unsigned int uniphier_get_soc_model(void);