armv8: mmu: Add support of non-identical mapping

Introduce virtual and physical addresses in the mapping table. This change
have no impact on existing boards because they all use idential mapping.

Signed-off-by: York Sun <york.sun@nxp.com>

arch/arm/include/asm/armv8/mmu.h

@@ -135,7 +135,8 @@ static inline void set_ttbr_tcr_mair(int el, u64 table, u64 tcr, u64 attr)
 }
 
 struct mm_region {
-	u64 base;
+	u64 virt;
+	u64 phys;
 	u64 size;
 	u64 attrs;
 };