ARM: dts: imx6dl-yapp4: Use reset-gpios property name

Use the gpios instead of gpio suffix that is mandated by the binding.
This dtbs_check warning is fixed now:

  touchscreen@5c: Unevaluated properties are not allowed ('reset-gpio' was unexpected)

The reset signal worked correctly as both the "gpio" and "gpios" suffixes
are actually allowed by the gpiolib.
Signed-off-by: Michal Vokáč <michal.vokac@ysoft.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6dl-yapp4-common.dtsi

@@ -313,7 +313,7 @@ touchscreen: touchscreen@5c {
 		interrupt-parent = <&gpio4>;
 		interrupts = <5 IRQ_TYPE_EDGE_FALLING>;
 		attb-gpio = <&gpio4 5 GPIO_ACTIVE_HIGH>;
-		reset-gpio = <&gpio1 2 GPIO_ACTIVE_HIGH>;
+		reset-gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>;
 		touchscreen-size-x = <800>;
 		touchscreen-size-y = <480>;
 		status = "disabled";