ARM: dts: imx6qdl-apalis: Use enable-gpios property for backlight

Use enable-gpios property of PWM backlight driver for backlight
control.
Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-apalis.dtsi

@@ -49,7 +49,10 @@ / {
 
 	backlight: backlight {
 		compatible = "pwm-backlight";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_gpio_bl_on>;
 		pwms = <&pwm4 0 5000000>;
+		enable-gpios = <&gpio3 13 GPIO_ACTIVE_HIGH>;
 		status = "disabled";
 	};
 
@@ -620,6 +623,12 @@ MX6QDL_PAD_KEY_ROW4__FLEXCAN2_RX 0x1b0b0
 		>;
 	};
 
+	pinctrl_gpio_bl_on: gpioblon {
+		fsl,pins = <
+			MX6QDL_PAD_EIM_DA13__GPIO3_IO13 0x1b0b0
+		>;
+	};
+
 	pinctrl_gpio_keys: gpio1io04grp {
 		fsl,pins = <
 			/* Power button */