bcm63xx: AV4202N: add missing PCI pinmux

The ADB P.DG AV4202N device has a wifi chipset connected via PCI. But the
PCI pinmux is missing and without it the wifi won't work properly.

Add the pinctrl_pci to enable the missing PCI pins for this device.

Signed-off-by: Daniel González Cabanelas <dgcbueu@gmail.com>

target/linux/bcm63xx/dts/bcm6368-adb-av4202n.dts

@@ -104,6 +104,11 @@
 	};
 };
 
+&pinctrl {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_pci>;
+};
+
 &uart0 {
 	status = "okay";
 };