arm64: dts: qcom: x1e80100-pmics: Add PMC8380C PWM

The PMC8380C (PM8550) has a PWM block, describe it.

Signed-off-by: Konrad Dybcio <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bjorn Andersson <[e-mail]>

arch/arm64/boot/dts/qcom/x1e80100-pmics.dtsi

···
 			interrupt-controller;
 			#interrupt-cells = <2>;
 		};
+
+		pmk8550_pwm: pwm {
+			compatible = "qcom,pmk8550-pwm";
+
+			#pwm-cells = <2>;
+
+			status = "disabled";
+		};
 	};
 
 	/* PMC8380C */