arm64: dts: mediatek: mt8183: align Google CROS EC PWM node name with dtschema

dtschema expects PWM node name to be a generic "pwm".  This also matches
Devicetree specification requirements about generic node names.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220214081916.162014-3-krzysztof.kozlowski@canonical.comSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm64/boot/dts/mediatek/mt8183-kukui-jacuzzi.dtsi

@@ -92,7 +92,7 @@ volume_up {
 };
 
 &cros_ec {
-	cros_ec_pwm: ec-pwm {
+	cros_ec_pwm: pwm {
 		compatible = "google,cros-ec-pwm";
 		#pwm-cells = <1>;
 		status = "disabled";