mediatek: mt7986: move gpio-controller up and rename pinctrl to pio

Move gpio-controller up to pinctrl node and rename label to "pio" to
match the label used in upstream kernel linux.

Update any DTS that reference the pinctrl to follow the new naming and
structure.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
diff --git a/arch/arm/dts/mt7986b-sd-rfb.dts b/arch/arm/dts/mt7986b-sd-rfb.dts
index ec80a2f..e5fb4d7 100644
--- a/arch/arm/dts/mt7986b-sd-rfb.dts
+++ b/arch/arm/dts/mt7986b-sd-rfb.dts
@@ -49,7 +49,7 @@
 	mediatek,gmac-id = <0>;
 	phy-mode = "2500base-x";
 	mediatek,switch = "mt7531";
-	reset-gpios = <&gpio 5 GPIO_ACTIVE_HIGH>;
+	reset-gpios = <&pio 5 GPIO_ACTIVE_HIGH>;
 
 	fixed-link {
 		speed = <2500>;
@@ -57,7 +57,7 @@
 	};
 };
 
-&pinctrl {
+&pio {
 	spi_flash_pins: spi0-pins-func-1 {
 		mux {
 			function = "flash";