8xxx: Break out DMA code to a common file

DMA support is now enabled via the CONFIG_FSL_DMA define instead of the
previous CONFIG_DDR_ECC

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/include/configs/PM856.h b/include/configs/PM856.h
index 43c2873..1db20bc 100644
--- a/include/configs/PM856.h
+++ b/include/configs/PM856.h
@@ -98,6 +98,7 @@
 #undef CONFIG_DDR_SPD
 #define CONFIG_DDR_DLL                      /* possible DLL fix needed */
 #define CONFIG_DDR_ECC			    /* only for ECC DDR module */
+#define CONFIG_FSL_DMA			    /* use DMA to init DDR ECC  */
 
 #define CONFIG_MEM_INIT_VALUE	0xDeadBeef