ARM: dts: am335x-bone-common: switch mmc1 to 4-bit mode

The micro-SD slot hooks up all four data pins so lets' use them.
Signed-off-by: NKoen Kooi <koen@dominion.thruhere.net>
Tested-by: NKevin Hilman <khilman@linaro.org>
Reviewed-by: NNishanth Menon <nm@ti.com>
Signed-off-by: NBenoit Cousson <bcousson@baylibre.com>

arch/arm/boot/dts/am335x-bone-common.dtsi

@@ -291,6 +291,7 @@
 
 &mmc1 {
 	status = "okay";
+	bus-width = <0x4>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&mmc1_pins>;
 	cd-gpios = <&gpio0 6 GPIO_ACTIVE_HIGH>;