Remove several warnings reported with W=1

Improved support for W=1 compilation flag by solving missing-prototypes
and old-style-definition warnings.

The libraries are compiling with warnings (which turn into errors with
the Werror flag).

Outside of libraries, some warnings cannot be fixed without heavy
structural changes.

Change-Id: I1668cf99123ac4195c2a6a1d48945f7a64c67f16
Signed-off-by: Ambroise Vincent <ambroise.vincent@arm.com>
diff --git a/plat/common/plat_spm_sp.c b/plat/common/plat_spm_sp.c
index ce48279..bc3d6a0 100644
--- a/plat/common/plat_spm_sp.c
+++ b/plat/common/plat_spm_sp.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, Arm Limited. All rights reserved.
+ * Copyright (c) 2018-2019, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -9,6 +9,7 @@
 #include <platform_def.h>
 
 #include <common/debug.h>
+#include <plat/common/platform.h>
 #include <tools_share/sptool.h>
 
 static unsigned int sp_next;