Driver/DDR: combine ccsr_ddr for 83xx, 85xx and 86xx

Fix ccsr_ddr structure to avoid using typedef. Combine DDR2 and DDR3
structure for 83xx, 85xx and 86xx.

Signed-off-by: York Sun <yorksun@freescale.com>
diff --git a/board/freescale/mpc8610hpcd/mpc8610hpcd.c b/board/freescale/mpc8610hpcd/mpc8610hpcd.c
index aa99623..d8740dd 100644
--- a/board/freescale/mpc8610hpcd/mpc8610hpcd.c
+++ b/board/freescale/mpc8610hpcd/mpc8610hpcd.c
@@ -143,7 +143,7 @@
 {
 #if !defined(CONFIG_SYS_RAMBOOT)
 	volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
-	volatile ccsr_ddr_t *ddr = &immap->im_ddr1;
+	struct ccsr_ddr __iomem *ddr = &immap->im_ddr1;
 	uint d_init;
 
 	ddr->cs0_bnds = 0x0000001f;