arm: dts: imx8mp-phyboard-pollux-rdk-u-boot: Add wdog pinctrl entry

Add missing pinctrl entry in spl.
Signed-off-by: NTeresa Remmet <t.remmet@phytec.de>
Reviewed-by: NFabio Estevam <festevam@gmail.com>

arch/arm/dts/imx8mp-phyboard-pollux-rdk-u-boot.dtsi

@@ -34,6 +34,10 @@
 	u-boot,dm-spl;
 };
 
+&pinctrl_wdog {
+	u-boot,dm-spl;
+};
+
 &gpio1 {
 	u-boot,dm-spl;
 };