plat/arm: Sanitise includes

Use full include paths like it is done for common includes.

This cleanup was started in commit d40e0e08283a ("Sanitise includes
across codebase"), but it only cleaned common files and drivers. This
patch does the same to Arm platforms.

Change-Id: If982e6450bbe84dceb56d464e282bcf5d6d9ab9b
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/lib/utils/mem_region.c b/lib/utils/mem_region.c
index 662f6a0..08bccf6 100644
--- a/lib/utils/mem_region.c
+++ b/lib/utils/mem_region.c
@@ -6,7 +6,9 @@
 
 #include <assert.h>
 
+#include <common/debug.h>
 #include <lib/utils.h>
+#include <lib/xlat_tables/xlat_tables_compat.h>
 
 /*
  * All the regions defined in mem_region_t must have the following properties