ARM: dts: koelsch: Rename sw2 to keyboard

Rename "sw2_pins" and "sw2" to "keyboard_pins" resp. "keyboard", to
comply with generic name recommendations.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/3d718cf69e21b1ceea0c29c0e841b9bdda44533d.1619785905.git.geert+renesas@glider.be

arch/arm/boot/dts/r8a7791-koelsch.dts

@@ -81,7 +81,7 @@ lbsc {
 	keyboard {
 		compatible = "gpio-keys";
 
-		pinctrl-0 = <&sw2_pins>;
+		pinctrl-0 = <&keyboard_pins>;
 		pinctrl-names = "default";
 
 		key-1 {
@@ -622,7 +622,7 @@ sound_clk_pins: sound_clk {
 		function = "audio_clk";
 	};
 
-	sw2_pins: sw2 {
+	keyboard_pins: keyboard {
 		pins = "GP_5_0", "GP_5_1", "GP_5_2", "GP_5_3";
 		bias-pull-up;
 	};