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/nand_spl/board/freescale/p1023rds/nand_boot.c b/nand_spl/board/freescale/p1023rds/nand_boot.c
index 58e6cbf..d9afa6d 100644
--- a/nand_spl/board/freescale/p1023rds/nand_boot.c
+++ b/nand_spl/board/freescale/p1023rds/nand_boot.c
@@ -18,7 +18,8 @@
 /* Fixed sdram init -- doesn't use serial presence detect. */
 void sdram_init(void)
 {
-	ccsr_ddr_t *ddr = (ccsr_ddr_t *)CONFIG_SYS_FSL_DDR_ADDR;
+	struct ccsr_ddr __iomem *ddr =
+		(struct ccsr_ddr __iomem *)CONFIG_SYS_FSL_DDR_ADDR;
 
 	set_next_law(0, LAW_SIZE_2G, LAW_TRGT_IF_DDR_1);