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/board/cavium/thunderx/thunderx.c b/board/cavium/thunderx/thunderx.c
index 9131a38..960ca53 100644
--- a/board/cavium/thunderx/thunderx.c
+++ b/board/cavium/thunderx/thunderx.c
@@ -45,16 +45,19 @@
 
 static struct mm_region thunderx_mem_map[] = {
 	{
-		.base = 0x000000000000UL,
+		.virt = 0x000000000000UL,
+		.phys = 0x000000000000UL,
 		.size = 0x40000000000UL,
 		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) | PTE_BLOCK_NON_SHARE,
 	}, {
-		.base = 0x800000000000UL,
+		.virt = 0x800000000000UL,
+		.phys = 0x800000000000UL,
 		.size = 0x40000000000UL,
 		.attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
 			 PTE_BLOCK_NON_SHARE,
 	}, {
-		.base = 0x840000000000UL,
+		.virt = 0x840000000000UL,
+		.phys = 0x840000000000UL,
 		.size = 0x40000000000UL,
 		.attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
 			 PTE_BLOCK_NON_SHARE,