lantiq: dts: use generic node names

In DTS Checklist[1] we're now demanding proper generic node names, as
the name of a node should reflect the function of the device and use
generic name for that[2]. Everybody seems to be copy&pasting from DTS
files available in the repository today, so let's unify that naming
there as well and provide proper examples.

1. https://openwrt.org/submitting-patches#dts_checklist
2. https://github.com/devicetree-org/devicetree-specification/blob/master/source/devicetree-basics.rst#generic-names-recommendation

Signed-off-by: Petr Štetiar <ynezz@true.cz>
[split out treewide patch, integrated P2812HNUF1 rename patch]
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
[merged key and led changes, use generic node name for flash, wifi and
gpio]
Signed-off-by: Mathias Kresin <dev@kresin.me>

target/linux/lantiq/files/arch/mips/boot/dts/ARV752DPW22.dts

@@ -28,7 +28,7 @@
 		reg = <0x0 0x4000000>;
 	};
 
-	gpio-keys-polled {
+	keys {
 		compatible = "gpio-keys-polled";
 		poll-interval = <100>;
 
@@ -54,7 +54,7 @@
 		};
 	};
 
-	gpio-leds {
+	leds {
 		compatible = "gpio-leds";
 		power_blue: power1 {
 			label = "arv752dpw22:blue:power";
@@ -187,7 +187,7 @@
 };
 
 &localbus {
-	nor@0 {
+	flash@0 {
 		compatible = "lantiq,nor";
 		bank-width = <2>;
 		reg = <0 0x0 0x800000>;
@@ -222,7 +222,7 @@
 		};
 	};
 
-	gpiomm: gpiomm@1 {
+	gpiomm: gpio@1 {
 		compatible = "lantiq,gpio-mm";
 		reg = <1 0x0 0x10 >;
 		#address-cells = <1>;