ath79: dts: Unify naming of gpio-keys nodes

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>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com> [split up]

target/linux/ath79/dts/ar7161_buffalo_wzr-hp-ag300h.dts

@@ -80,7 +80,7 @@
 		};
 	};
 
-	gpio-keys-polled {
+	keys {
 		compatible = "gpio-keys-polled";
 		poll-interval = <20>;
 

target/linux/ath79/dts/ar7161_netgear_wndr3700.dtsi

@@ -80,7 +80,7 @@
 		};
 	};
 
-	gpio-keys-polled {
+	keys {
 		compatible = "gpio-keys-polled";
 		poll-interval = <100>;
 

target/linux/ath79/dts/ar7161_ubnt_routerstation.dtsi

@@ -34,7 +34,7 @@
 		};
 	};
 
-	gpio-keys-polled {
+	keys {
 		compatible = "gpio-keys-polled";
 		poll-interval = <20>;
 

target/linux/ath79/dts/ar7240_buffalo_whr-g301n.dts

@@ -16,7 +16,7 @@
 		led-upgrade = &diag;
 	};
 
-	gpio-keys-polled {
+	keys {
 		compatible = "gpio-keys-polled";
 		poll-interval = <20>;
 

target/linux/ath79/dts/ar7240_netgear_wnr612-v2.dtsi

@@ -14,7 +14,7 @@
 		led-upgrade = &power;
 	};
 
-	gpio-keys-polled {
+	keys {
 		compatible = "gpio-keys-polled";
 		poll-interval = <20>;
 

target/linux/ath79/dts/ar7240_tplink_tl-wr74xn-v1.dtsi

@@ -13,7 +13,7 @@
 		led-upgrade = &led_system;
 	};
 
-	gpio-keys-polled {
+	keys {
 		compatible = "gpio-keys-polled";
 		poll-interval = <20>;
 

target/linux/ath79/dts/ar7241_tplink.dtsi

@@ -13,7 +13,7 @@
 		led-upgrade = &led_system;
 	};
 
-	gpio-keys-polled {
+	keys {
 		compatible = "gpio-keys-polled";
 		poll-interval = <20>;
 

target/linux/ath79/dts/ar7242_avm_fritz300e.dts

@@ -17,7 +17,7 @@
 		led-upgrade = &power;
 	};
 
-	gpio-keys {
+	keys {
 		compatible = "gpio-keys-polled";
 		poll-interval = <20>;
 

target/linux/ath79/dts/ar7242_tplink_tl-wr2543-v1.dts

@@ -27,7 +27,7 @@
 		clock-frequency = <40000000>;
 	};
 
-	gpio-keys {
+	keys {
 		compatible = "gpio-keys-polled";
 		poll-interval = <20>;
 

target/linux/ath79/dts/ar9331_pisen_wmm003n.dts

@@ -18,7 +18,7 @@
 		led-upgrade = &led_system;
 	};
 
-	gpio-keys-polled {
+	keys {
 		compatible = "gpio-keys-polled";
 		poll-interval = <20>;
 

target/linux/ath79/dts/ar9331_tplink_tl-wr703n_tl-mr10u.dtsi

@@ -15,7 +15,7 @@
 		led-upgrade = &system;
 	};
 
-	gpio-keys-polled {
+	keys {
 		compatible = "gpio-keys-polled";
 		poll-interval = <20>;
 

target/linux/ath79/dts/ar9331_tplink_tl-wr741nd-v4.dtsi

@@ -18,7 +18,7 @@
 		led-upgrade = &system;
 	};
 
-	gpio-keys-polled {
+	keys {
 		compatible = "gpio-keys-polled";
 		poll-interval = <20>;
 

target/linux/ath79/dts/qca9557_buffalo_bhr-4grv2.dts

@@ -46,7 +46,7 @@
 		};
 	};
 
-	gpio-keys-polled {
+	keys {
 		compatible = "gpio-keys-polled";
 		poll-interval = <20>;