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/p2020ds/p2020ds.c b/board/freescale/p2020ds/p2020ds.c
index dd8c6b1..a0cf927 100644
--- a/board/freescale/p2020ds/p2020ds.c
+++ b/board/freescale/p2020ds/p2020ds.c
@@ -68,7 +68,8 @@
 
 phys_size_t fixed_sdram(void)
 {
-	volatile 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;
 	uint d_init;
 
 	ddr->cs0_config = CONFIG_SYS_DDR_CS0_CONFIG;