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/imx/common/sci/imx8_mu.h b/plat/imx/common/sci/imx8_mu.h
index 8834a97..8c78877 100644
--- a/plat/imx/common/sci/imx8_mu.h
+++ b/plat/imx/common/sci/imx8_mu.h
@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#include <types.h>
+#include <stdint.h>
 
 #define MU_ATR0_OFFSET1		0x0
 #define MU_ARR0_OFFSET1		0x10