ARM: dts: imx28-duckbill: fix mmc settings

I2SE's duckbills are only equipped with a micro SD card slot and
thus only provide a 4-bit interface.
Signed-off-by: NMichael Heimpold <mhei@heimpold.de>
Acked-by: NStefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: NShawn Guo <shawn.guo@freescale.com>

arch/arm/boot/dts/imx28-duckbill.dts

@@ -25,9 +25,9 @@
 			ssp0: ssp@80010000 {
 				compatible = "fsl,imx28-mmc";
 				pinctrl-names = "default";
-				pinctrl-0 = <&mmc0_8bit_pins_a
+				pinctrl-0 = <&mmc0_4bit_pins_a
 					&mmc0_cd_cfg &mmc0_sck_cfg>;
-				bus-width = <8>;
+				bus-width = <4>;
 				vmmc-supply = <&reg_3p3v>;
 				status = "okay";
 			};