arm64: dts: qcom: pm8550: add PWM controller

Add the PWM function to the pm8550 dtsi, this is usually used
to drive RGB leds on platforms using this PMIC.
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230525-topic-sm8550-upstream-pm8550-lpg-dt-v4-1-a288f24af81b@linaro.org

arch/arm64/boot/dts/qcom/pm8550.dtsi

@@ -61,5 +61,15 @@ pm8550_flash: led-controller@ee00 {
 			reg = <0xee00>;
 			status = "disabled";
 		};
+
+		pm8550_pwm: pwm {
+			compatible = "qcom,pm8550-pwm", "qcom,pm8350c-pwm";
+
+			#address-cells = <1>;
+			#size-cells = <0>;
+			#pwm-cells = <2>;
+
+			status = "disabled";
+		};
 	};
 };