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>
diff --git a/bl2/aarch32/bl2_arch_setup.c b/bl2/aarch32/bl2_arch_setup.c
index db8a068..4fd8d07 100644
--- a/bl2/aarch32/bl2_arch_setup.c
+++ b/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
diff --git a/bl2/bl2_private.h b/bl2/bl2_private.h
index 7fd17bf..01f6c6b 100644
--- a/bl2/bl2_private.h
+++ b/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
diff --git a/plat/common/plat_log_common.c b/plat/common/plat_log_common.c
index 49e1c15..c757c6b 100644
--- a/plat/common/plat_log_common.c
+++ b/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