arm/km: use CONFIG_NAND_ECC_BCH

Switch from 1-bit ecc to 4-bit ecc.

Signed-off-by: Holger Brunck <holger.brunck@keymile.com>
cc: Valentin Longchamp <valentin.longchamp@keymile.com>
cc: Prafulla Wadaskar <prafulla@marvell.com>
Acked-By: Prafulla Wadaskar <prafulla@marvell.com>

include/configs/km/km_arm.h

@@ -50,6 +50,9 @@
 
 #define CONFIG_MACH_TYPE	MACH_TYPE_KM_KIRKWOOD
 
+#define CONFIG_NAND_ECC_BCH
+#define CONFIG_BCH
+
 /* include common defines/options for all Keymile boards */
 #include "keymile-common.h"