arm/ls1021a: Remove ccsr_ddr from immap_ls102xa.h

ccsr_ddr structure is already defined in fsl_immap.h. Remove
this duplicated define. Move fixed timing into ls1021atwr.h.

Signed-off-by: York Sun <yorksun@freescale.com>
CC: Alison Wang <alison.wang@freescale.com>
Acked-by: Alison Wang <alison.wang@freescale.com>
diff --git a/board/freescale/ls1021atwr/ls1021atwr.c b/board/freescale/ls1021atwr/ls1021atwr.c
index ed5bd27..043d938 100644
--- a/board/freescale/ls1021atwr/ls1021atwr.c
+++ b/board/freescale/ls1021atwr/ls1021atwr.c
@@ -16,6 +16,7 @@
 #include <mmc.h>
 #include <fsl_esdhc.h>
 #include <fsl_ifc.h>
+#include <fsl_immap.h>
 #include <netdev.h>
 #include <fsl_mdio.h>
 #include <tsec.h>