ARM: kirkwood: provide pinctrl default to sdio nodes

SDIO controllers found on Marvell Kirkwood 6281/6282 SoCs require
pins to be muxed by pinctrl. As there is only one sane pinctrl
setting for this, provide default pinctrl properties to the controller
nodes.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

arch/arm/boot/dts/kirkwood-6281.dtsi

@@ -97,6 +97,8 @@ mvsdio@90000 {
 			reg = <0x90000 0x200>;
 			interrupts = <28>;
 			clocks = <&gate_clk 4>;
+			pinctrl-0 = <&pmx_sdio>;
+			pinctrl-names = "default";
 			bus-width = <4>;
 			cap-sdio-irq;
 			cap-sd-highspeed;

arch/arm/boot/dts/kirkwood-6282.dtsi

@@ -125,6 +125,8 @@ mvsdio@90000 {
 			reg = <0x90000 0x200>;
 			interrupts = <28>;
 			clocks = <&gate_clk 4>;
+			pinctrl-0 = <&pmx_sdio>;
+			pinctrl-names = "default";
 			bus-width = <4>;
 			cap-sdio-irq;
 			cap-sd-highspeed;