arm64: dts: qcom: 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@canonical.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220214081916.162014-4-krzysztof.kozlowski@canonical.com

arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi

@@ -637,7 +637,7 @@ cros_ec: ec@0 {
 		pinctrl-0 = <&ap_ec_int_l>;
 		spi-max-frequency = <3000000>;
 
-		cros_ec_pwm: ec-pwm {
+		cros_ec_pwm: pwm {
 			compatible = "google,cros-ec-pwm";
 			#pwm-cells = <1>;
 		};

arch/arm64/boot/dts/qcom/sc7280-herobrine-herobrine-r0.dts

@@ -705,7 +705,7 @@ cros_ec: ec@0 {
 		pinctrl-0 = <&ap_ec_int_l>;
 		spi-max-frequency = <3000000>;
 
-		cros_ec_pwm: ec-pwm {
+		cros_ec_pwm: pwm {
 			compatible = "google,cros-ec-pwm";
 			#pwm-cells = <1>;
 		};

arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi

@@ -421,7 +421,7 @@ cros_ec: ec@0 {
 		pinctrl-0 = <&ap_ec_int_l>;
 		spi-max-frequency = <3000000>;
 
-		cros_ec_pwm: ec-pwm {
+		cros_ec_pwm: pwm {
 			compatible = "google,cros-ec-pwm";
 			#pwm-cells = <1>;
 		};

arch/arm64/boot/dts/qcom/sc7280-idp-ec-h1.dtsi

@@ -20,7 +20,7 @@ cros_ec: ec@0 {
 		pinctrl-0 = <&ap_ec_int_l>;
 		spi-max-frequency = <3000000>;
 
-		cros_ec_pwm: ec-pwm {
+		cros_ec_pwm: pwm {
 			compatible = "google,cros-ec-pwm";
 			#pwm-cells = <1>;
 		};

arch/arm64/boot/dts/qcom/sdm845-cheza.dtsi

@@ -708,7 +708,7 @@ cros_ec: ec@0 {
 		pinctrl-0 = <&ec_ap_int_l>;
 		spi-max-frequency = <3000000>;
 
-		cros_ec_pwm: ec-pwm {
+		cros_ec_pwm: pwm {
 			compatible = "google,cros-ec-pwm";
 			#pwm-cells = <1>;
 		};