85xx: separate FLASH BASE virtual from physical address

Added a CONFIG_SYS_FLASH_BASE_PHYS for use as the physical address and
maintain CONFIG_SYS_FLASH_BASE as the virtual address of the flash.

This allows us to deal with 36-bit phys on these boards in the future.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Andy Fleming <afleming@freescale.com>
diff --git a/board/freescale/mpc8536ds/tlb.c b/board/freescale/mpc8536ds/tlb.c
index 89d5097..f4bab55 100644
--- a/board/freescale/mpc8536ds/tlb.c
+++ b/board/freescale/mpc8536ds/tlb.c
@@ -53,7 +53,7 @@
 
 	/* W**G* - Flash/promjet, localbus */
 	/* This will be changed to *I*G* after relocation to RAM. */
-	SET_TLB_ENTRY(1, CONFIG_SYS_FLASH_BASE, CONFIG_SYS_FLASH_BASE,
+	SET_TLB_ENTRY(1, CONFIG_SYS_FLASH_BASE, CONFIG_SYS_FLASH_BASE_PHYS,
 		      MAS3_SX|MAS3_SR, MAS2_W|MAS2_G,
 		      0, 1, BOOKE_PAGESZ_256M, 1),