arm64: dts: qcom: sdm660-xiaomi-lavender: Add PWRKEY and RESIN

This enables the volume down key as well as the power button.
Reviewed-by: NKonrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: NDang Huynh <danct12@riseup.net>
Reviewed-by: NCaleb Connolly <caleb@connolly.tech>
Signed-off-by: NBjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211120214227.779742-5-danct12@riseup.net

arch/arm64/boot/dts/qcom/sdm660-xiaomi-lavender.dts

@@ -53,6 +53,16 @@
 	status = "okay";
 };
 
+&pon_pwrkey {
+	status = "okay";
+};
+
+&pon_resin {
+	status = "okay";
+
+	linux,code = <KEY_VOLUMEDOWN>;
+};
+
 &rpm_requests {
 	pm660l-regulators {
 		compatible = "qcom,rpm-pm660l-regulators";