xlat lib: Use mmap_attr_t type consistently

This patch modifies both versions of the translation table library
to use the mmap_attr_t type consistently wherever it is manipulating
MT_* attributes variables. It used to use mmap_attr_t or plain integer
types interchangeably, which compiles fine because an enumeration type
can be silently converted to an integer, but which is semantically
incorrect.

This patch removes this assumption by using the abstract type
'mmap_attr_t' all the time.

Change-Id: Id1f099025d2cb962b275bb7e39ad2c4dbb4e366c
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
diff --git a/include/lib/xlat_tables/xlat_tables.h b/include/lib/xlat_tables/xlat_tables.h
index 4e85503..38150f5 100644
--- a/include/lib/xlat_tables/xlat_tables.h
+++ b/include/lib/xlat_tables/xlat_tables.h
@@ -108,7 +108,7 @@
 /* Generic translation table APIs */
 void init_xlat_tables(void);
 void mmap_add_region(unsigned long long base_pa, uintptr_t base_va,
-				size_t size, unsigned int attr);
+				size_t size, mmap_attr_t attr);
 void mmap_add(const mmap_region_t *mm);
 
 #endif /*__ASSEMBLY__*/