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/sbc8548/ddr.c b/board/sbc8548/ddr.c
index 8817103..24cc776 100644
--- a/board/sbc8548/ddr.c
+++ b/board/sbc8548/ddr.c
@@ -91,7 +91,8 @@
  */
 phys_size_t fixed_sdram(void)
 {
-	volatile ccsr_ddr_t *ddr = (void *)(CONFIG_SYS_FSL_DDR_ADDR);
+	struct ccsr_ddr __iomem *ddr =
+		(struct ccsr_ddr __iomem *)(CONFIG_SYS_FSL_DDR_ADDR);
 
 	out_be32(&ddr->cs0_bnds,	0x0000007f);
 	out_be32(&ddr->cs1_bnds,	0x008000ff);