bl1: include bl1_private.h in aarch* files

This change avoids warnings when setting -Wmissing-prototypes or when
using sparse tool.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@st.com>

bl1/aarch32/bl1_arch_setup.c

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
+#include "../bl1_private.h"
 
 /*******************************************************************************
  * TODO: Function that does the first bit of architectural setup.

bl1/aarch32/bl1_context_mgmt.c

@@ -11,6 +11,7 @@
 #include <debug.h>
 #include <platform.h>
 #include <smcc_helpers.h>
+#include "../bl1_private.h"
 
 /*
  * Following arrays will be used for context management.

bl1/aarch64/bl1_arch_setup.c

@@ -6,6 +6,7 @@
 
 #include <arch.h>
 #include <arch_helpers.h>
+#include "../bl1_private.h"
 
 /*******************************************************************************
  * Function that does the first bit of architectural setup that affects

bl1/aarch64/bl1_context_mgmt.c

@@ -10,6 +10,7 @@
 #include <context_mgmt.h>
 #include <debug.h>
 #include <platform.h>
+#include "../bl1_private.h"
 
 /*
  * Following array will be used for context management.