Stop using immap_t on 85xx

In the future the offsets to various blocks may not be in same location.
Move to using CFG_MPC85xx_*_ADDR as the base of the registers
instead of getting it via &immap.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/board/tqm85xx/sdram.c b/board/tqm85xx/sdram.c
index 8ca50f5..2053ade 100644
--- a/board/tqm85xx/sdram.c
+++ b/board/tqm85xx/sdram.c
@@ -57,8 +57,7 @@
 long int sdram_setup(int casl)
 {
 	int i;
-	volatile immap_t *immap = (immap_t *) CFG_IMMR;
-	volatile ccsr_ddr_t *ddr = &immap->im_ddr;
+	volatile ccsr_ddr_t *ddr = (void *)(CFG_MPC85xx_DDR_ADDR);
 	unsigned long cfg_ddr_timing1;
 	unsigned long cfg_ddr_mode;