Fix MISRA rule 8.4 Part 1

Rule 8.4: A compatible declaration shall be visible when
          an object or function with external linkage is defined

Fixed for:
	make DEBUG=1 PLAT=fvp LOG_LEVEL=50 all

Change-Id: I7c2ad3f5c015411c202605851240d5347e4cc8c7
Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>
diff --git a/lib/xlat_tables_v2/xlat_tables_internal.c b/lib/xlat_tables_v2/xlat_tables_internal.c
index 75c5a91..653260c 100644
--- a/lib/xlat_tables_v2/xlat_tables_internal.c
+++ b/lib/xlat_tables_v2/xlat_tables_internal.c
@@ -115,7 +115,7 @@
 /*
  * Returns a block/page table descriptor for the given level and attributes.
  */
-uint64_t xlat_desc(const xlat_ctx_t *ctx, mmap_attr_t attr,
+static uint64_t xlat_desc(const xlat_ctx_t *ctx, mmap_attr_t attr,
 		   unsigned long long addr_pa, int level)
 {
 	uint64_t desc;