arm64: dts: qcom: sdm845-xiaomi-beryllium: enable qcom wled backlight and link to panel

Xiaomi Poco F1 uses the QCOM WLED driver for backlight control.
Enable and link it to the panel to use it.
Signed-off-by: Joel Selvaraj <jo@jsfamily.in>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/BY5PR02MB70092607CD7CDD8CF8BCD464D9E09@BY5PR02MB7009.namprd02.prod.outlook.com

arch/arm64/boot/dts/qcom/sdm845-xiaomi-beryllium.dts

@@ -231,6 +231,7 @@ panel@0 {
 		#address-cells = <1>;
 		#size-cells = <0>;
 
+		backlight = <&pmi8998_wled>;
 		reset-gpios = <&tlmm 6 GPIO_ACTIVE_LOW>;
 
 		port {
@@ -314,6 +315,17 @@ vol_up_pin_a: vol-up-active {
 	};
 };
 
+&pmi8998_wled {
+	status = "okay";
+	qcom,current-boost-limit = <970>;
+	qcom,ovp-millivolt = <29600>;
+	qcom,current-limit-microamp = <20000>;
+	qcom,num-strings = <2>;
+	qcom,switching-freq = <600>;
+	qcom,external-pfet;
+	qcom,cabc;
+};
+
 &pm8998_pon {
 	resin {
 		compatible = "qcom,pm8941-resin";