ramips: rt2880: convert devices to interrupt-driven gpio-keys

This converts all RT2880 devices to use interrupt based gpio-keys
instead of gpio-keys-polled. The poll-interval will be removed.

Signed-off-by: Shiji Yang <yangshiji66@qq.com>
Link: https://github.com/openwrt/openwrt/pull/16764
Signed-off-by: Robert Marko <robimarko@gmail.com>

target/linux/ramips/dts/rt2880_airlink101_ar670w.dts

@@ -76,8 +76,7 @@
 	};
 
 	keys {
-		compatible = "gpio-keys-polled";
+		compatible = "gpio-keys";
-		poll-interval = <100>;
 
 		wps {
 			label = "wps";

target/linux/ramips/dts/rt2880_airlink101_ar725w.dts

@@ -87,8 +87,7 @@
 	};
 
 	keys {
-		compatible = "gpio-keys-polled";
+		compatible = "gpio-keys";
-		poll-interval = <100>;
 
 		wps {
 			label = "wps";

target/linux/ramips/dts/rt2880_asus_rt-n15.dts

@@ -75,8 +75,7 @@
 	};
 
 	keys {
-		compatible = "gpio-keys-polled";
+		compatible = "gpio-keys";
-		poll-interval = <100>;
 
 		wps {
 			label = "wps";

target/linux/ramips/dts/rt2880_belkin_f5d8235-v1.dts

@@ -113,8 +113,7 @@
 	};
 
 	keys {
-		compatible = "gpio-keys-polled";
+		compatible = "gpio-keys";
-		poll-interval = <100>;
 
 		wps {
 			label = "wps";

target/linux/ramips/dts/rt2880_buffalo_wli-tx4-ag300n.dts

@@ -69,8 +69,7 @@
 	};
 
 	keys {
-		compatible = "gpio-keys-polled";
+		compatible = "gpio-keys";
-		poll-interval = <100>;
 
 		wps {
 			label = "wps";

target/linux/ramips/dts/rt2880_buffalo_wzr-agl300nh.dts

@@ -74,8 +74,7 @@
 	};
 
 	keys {
-		compatible = "gpio-keys-polled";
+		compatible = "gpio-keys";
-		poll-interval = <100>;
 
 		wps {
 			label = "wps";

target/linux/ramips/dts/rt2880_dlink_dap-1522-a1.dts

@@ -67,8 +67,7 @@
 	};
 
 	keys {
-		compatible = "gpio-keys-polled";
+		compatible = "gpio-keys";
-		poll-interval = <100>;
 
 		reset {
 			label = "reset";

target/linux/ramips/dts/rt2880_ralink_v11st-fe.dts

@@ -62,8 +62,7 @@
 	};
 
 	keys {
-		compatible = "gpio-keys-polled";
+		compatible = "gpio-keys";
-		poll-interval = <100>;
 
 		wps {
 			label = "wps";