ramips: fix PCIe reset pins for MTC WR1201

This router has two reset pins, GPIO 8 and GPIO 19. We have to
configure them correctly to ensure that the wireless NICs work
properly.

Fixes: https://github.com/openwrt/openwrt/issues/11736
Signed-off-by: Shiji Yang <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/16009
Signed-off-by: Hauke Mehrtens <[email protected]>

target/linux/ramips/dts/mt7621_mtc_wr1201.dts

@@ -166,8 +166,18 @@
 	status = "okay";
 };
 
+&pcie_pins {
+	uart3 {
+		groups = "uart3";
+		function = "gpio";
+	};
+};
+
 &pcie {
 	status = "okay";
+
+	reset-gpios = <&gpio 8 GPIO_ACTIVE_LOW>,
+		      <&gpio 19 GPIO_ACTIVE_LOW>;
 };
 
 &pcie0 {