ARM: dts: imx6ul-14x14-evk: Replace deprecated spi-gpio properties

As stated in Documentation/devicetree/bindings/spi/spi-gpio.yaml,
'gpio-mosi' and 'gpio-sck' are deprecated properties.

Use the recommeded 'mosi-gpios' and 'sck-gpios' instead.
Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6ul-14x14-evk.dtsi

@@ -89,8 +89,8 @@ spi-4 {
 		pinctrl-names = "default";
 		pinctrl-0 = <&pinctrl_spi4>;
 		status = "okay";
-		gpio-sck = <&gpio5 11 0>;
-		gpio-mosi = <&gpio5 10 0>;
+		sck-gpios = <&gpio5 11 0>;
+		mosi-gpios = <&gpio5 10 0>;
 		cs-gpios = <&gpio5 7 GPIO_ACTIVE_LOW>;
 		num-chipselects = <1>;
 		#address-cells = <1>;