85xx: remove the unused ddr_enable_ecc in the board file

The DDR controller of 8548/8544/8568/8572/8536 processors
have the ECC data init feature, and the new DDR code is
using the feature, and we don't need the way with DMA to
init memory any more.

Signed-off-by: Dave Liu <daveliu@freescale.com>
Acked-by: Andy Fleming <afleming@freescale.com>
diff --git a/include/configs/MPC8544DS.h b/include/configs/MPC8544DS.h
index cdbbea6..a2d12ae 100644
--- a/include/configs/MPC8544DS.h
+++ b/include/configs/MPC8544DS.h
@@ -97,7 +97,7 @@
 #define CONFIG_SPD_EEPROM		/* Use SPD EEPROM for DDR setup */
 #define CONFIG_DDR_SPD
 
-#undef CONFIG_ECC_INIT_VIA_DDRCONTROLLER	/* DDR controller or DMA? */
+#define CONFIG_ECC_INIT_VIA_DDRCONTROLLER	/* DDR controller or DMA? */
 #define CONFIG_MEM_INIT_VALUE	0xDeadBeef
 
 #define CONFIG_SYS_DDR_SDRAM_BASE	0x00000000