arm64: dts: qcom: pm6150: Add label to pwrkey node

Some platforms don't want to use the pmic power key as the power key
event. Add a label so platforms can easily reference and mark this node
as status = "disabled".
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Cc: Kiran Gunda <kgunda@codeaurora.org>
Cc: Rajendra Nayak <rnayak@codeaurora.org>
Cc: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20200115025314.3054-1-swboyd@chromium.orgSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm64/boot/dts/qcom/pm6150.dtsi

@@ -20,7 +20,7 @@ pm6150_pon: pon@800 {
 			mode-bootloader = <0x2>;
 			mode-recovery = <0x1>;
 
-			pwrkey {
+			pm6150_pwrkey: pwrkey {
 				compatible = "qcom,pm8941-pwrkey";
 				interrupts = <0x0 0x8 0 IRQ_TYPE_EDGE_BOTH>;
 				debounce = <15625>;