ARM: dts: imx: ventana: add alternate PWM4 pinmux for GW54xx

The GW54xx can provide PWM4 out either the off-board backlight connector
or the off-board digital I/O connector. By default the pinmux routes it
to the backlight connector but this pinctl alternate provides documentation
for those who may want to change it.

Signed-off-by: Tim Harvey <[e-mail]>
Signed-off-by: Shawn Guo <[e-mail]>

arch/arm/boot/dts/imx6qdl-gw54xx.dtsi

···
 };
 
 &pwm4 {
-	pinctrl-names = "default";
-	pinctrl-0 = <&pinctrl_pwm4>;
+	pinctrl-names = "default", "state_dio";
+	pinctrl-0 = <&pinctrl_pwm4_backlight>;
+	pinctrl-1 = <&pinctrl_pwm4_dio>;
 	status = "okay";
 };
 
···
 			>;
 		};
 
-		pinctrl_pwm4: pwm4grp {
+		pinctrl_pwm4_backlight: pwm4grpbacklight {
 			fsl,pins = <
+				/* LVDS_PWM J6.5 */
 				MX6QDL_PAD_SD1_CMD__PWM4_OUT		0x1b0b1
+			>;
+		};
+
+		pinctrl_pwm4_dio: pwm4grpdio {
+			fsl,pins = <
+				/* DIO3 J16.4 */
+				MX6QDL_PAD_SD4_DAT2__PWM4_OUT		0x1b0b1
 			>;
 		};