correct some missing-prototype warnings

This avoids the following warnings:
no previous prototype for 'bl2_arch_setup' [-Wmissing-prototypes]
no previous prototype for 'plat_log_get_prefix' [-Wmissing-prototypes]

Also correct a compilation issue if BL2_IN_XIP_MEM is enabled:
uintptr_t is not defined.
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Signed-off-by: Yann Gautier <yann.gautier@st.com>

bl2/aarch32/bl2_arch_setup.c

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
+#include "../bl2_private.h"
 
 /*******************************************************************************
  * Place holder function to perform any Secure SVC specific architectural

bl2/bl2_private.h

@@ -8,6 +8,9 @@
 #define BL2_PRIVATE_H
 
 #if BL2_IN_XIP_MEM
+
+#include <stdint.h>
+
 /*******************************************************************************
  * Declarations of linker defined symbols which will tell us where BL2 lives
  * in Trusted ROM and RAM

plat/common/plat_log_common.c

@@ -5,6 +5,7 @@
  */
 
 #include <debug.h>
+#include <platform.h>
 
 /* Allow platforms to override the log prefix string */
 #pragma weak plat_log_get_prefix