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/stxgp3/stxgp3.c b/board/stxgp3/stxgp3.c
index 3b04949..3649acf 100644
--- a/board/stxgp3/stxgp3.c
+++ b/board/stxgp3/stxgp3.c
@@ -203,8 +203,7 @@
 board_early_init_f(void)
 {
 #if defined(CONFIG_PCI)
-    volatile immap_t *immr = (immap_t *)CFG_IMMR;
-    volatile ccsr_pcix_t *pci = &immr->im_pcix;
+    volatile ccsr_pcix_t *pci = (void *)(CFG_MPC85xx_PCIX_ADDR);
 
     pci->peer &= 0xfffffffdf; /* disable master abort */
 #endif