ARM: dts: Fix typo in regulator enable GPIO property in s5pv210-aquila

The property name should be "gpio", not "gpios". Fix it.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>

arch/arm/boot/dts/s5pv210-aquila.dts

@@ -46,7 +46,7 @@ vtf_reg: fixed-regulator@0 {
 			regulator-name = "V_TF_2.8V";
 			regulator-min-microvolt = <2800000>;
 			regulator-max-microvolt = <2800000>;
-			gpios = <&mp05 4 0>;
+			gpio = <&mp05 4 0>;
 			enable-active-high;
 		};