ARM: dts: imx7d-smegw01: Use pinctrl-0 for pinctrl_rfkill

Use pinctrl-0 for pinctrl_rfkill to fix the following
'make CHECK_DTBS=y imx7d-smegw01.dtb' warning:

regulator-wlan-rfkill: 'pinctrl-0' is a dependency of 'pinctrl-names'
Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx7d-smegw01.dts

@@ -67,7 +67,7 @@ reg_wifi: regulator-wifi {
 	reg_wlan_rfkill: regulator-wlan-rfkill {
 		compatible = "regulator-fixed";
 		pinctrl-names = "default";
-		pinctrl-2 = <&pinctrl_rfkill>;
+		pinctrl-0 = <&pinctrl_rfkill>;
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
 		regulator-name = "wlan_rfkill";