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>
diff --git a/arch/arm/mach-sunxi/board.c b/arch/arm/mach-sunxi/board.c
index 66e028e..01bfc93 100644
--- a/arch/arm/mach-sunxi/board.c
+++ b/arch/arm/mach-sunxi/board.c
@@ -46,13 +46,15 @@
 static struct mm_region sunxi_mem_map[] = {
 	{
 		/* SRAM, MMIO regions */
-		.base = 0x0UL,
+		.virt = 0x0UL,
+		.phys = 0x0UL,
 		.size = 0x40000000UL,
 		.attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
 			 PTE_BLOCK_NON_SHARE
 	}, {
 		/* RAM */
-		.base = 0x40000000UL,
+		.virt = 0x40000000UL,
+		.phys = 0x40000000UL,
 		.size = 0x80000000UL,
 		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
 			 PTE_BLOCK_INNER_SHARE