arm64: dts: ti: k3-j784s4: Enable WKUP_GPIO6 for SW3.1

SW3.1 is a physical switch muxing between OSPI NOR and OSPI NAND.
SW3.1 is connected to the wkup_gpio0_6 pin. Enable the support for
wkup_gpio0_6 for adding OSPI dual flash support.

Signed-off-by: Prasanth Babu Mantena <p-mantena@ti.com>

arch/arm64/boot/dts/ti/k3-j784s4-evm.dts

@@ -605,6 +605,12 @@ mcu_mcan1_gpio_pins_default: mcu-mcan1-gpio-default-pins {
 			J784S4_WKUP_IOPAD(0x060, PIN_INPUT, 7) /* (J35) WKUP_GPIO0_2 */
 		>;
 	};
+
+	wkup_gpio_pins_default: wkup_gpio_pins_default {
+		pinctrl-single,pins = <
+			J784S4_WKUP_IOPAD(0x070, PIN_INPUT, 7) /* (L37) WKUP_GPIO0_6 */
+		>;
+	};
 };
 
 &wkup_pmx1 {
@@ -810,6 +816,12 @@ &ufs_wrapper {
 	status = "okay";
 };
 
+&wkup_gpio0 {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&wkup_gpio_pins_default>;
+};
+
 &fss {
 	bootph-all;
 	status = "okay";