Simplify translation tables headers dependencies

The files affected by this patch don't really depend on `xlat_tables.h`.
By changing the included file it becomes easier to switch between the
two versions of the translation tables library.

Change-Id: Idae9171c490e0865cb55883b19eaf942457c4ccc
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/plat/common/aarch64/plat_common.c b/plat/common/aarch64/plat_common.c
index 4322341..0cf27ca 100644
--- a/plat/common/aarch64/plat_common.c
+++ b/plat/common/aarch64/plat_common.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2014-2017, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -30,7 +30,7 @@
 #include <assert.h>
 #include <console.h>
 #include <platform.h>
-#include <xlat_tables.h>
+#include <xlat_mmu_helpers.h>
 
 /*
  * The following platform setup functions are weakly defined. They