arm: dts: k3-j721e-common-proc-board: enable hyperflash mux sel GPIO

Add wkup_gpio pinmux setting which will be used for performing the
DT fixup for hbmc node according to mux selection state, on J721E
EVM, hypermux sel is tied to ·WKUP_GPIO0_8.

Signed-off-by: Vaishnav Achath <vaishnav.a@ti.com>
diff --git a/arch/arm/dts/k3-j721e-common-proc-board.dts b/arch/arm/dts/k3-j721e-common-proc-board.dts
index f3b6302..1b60054 100644
--- a/arch/arm/dts/k3-j721e-common-proc-board.dts
+++ b/arch/arm/dts/k3-j721e-common-proc-board.dts
@@ -213,6 +213,12 @@
 		>;
 	};
 
+	wkup_gpio_pins_default: wkup-gpio-pins-default {
+		pinctrl-single,pins = <
+			J721E_WKUP_IOPAD(0xd0, PIN_INPUT, 7) /* (C14) WKUP_GPIO0_8 */
+		>;
+	};
+
 	mcu_fss0_ospi1_pins_default: mcu-fss0-ospi1-pins-default {
 		pinctrl-single,pins = <
 			J721E_WKUP_IOPAD(0x34, PIN_OUTPUT, 0) /* (F22) MCU_OSPI1_CLK */
@@ -381,6 +387,11 @@
 	phy-names = "cdns3,usb3-phy";
 };
 
+&wkup_gpio0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&wkup_gpio_pins_default>;
+};
+
 &usbss1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&main_usbss1_pins_default>;