arm64: dts: qcom: sa8775p: pmic: add the power key

Add the power key node under the PON node for PMIC #0 on sa8775p.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230327125316.210812-10-brgl@bgdev.pl

arch/arm64/boot/dts/qcom/sa8775p-pmics.dtsi

@@ -19,6 +19,13 @@ pmm8654au_0_pon: pon@1200 {
 			reg-names = "hlos", "pbs";
 			mode-recovery = <0x1>;
 			mode-bootloader = <0x2>;
+
+			pmm8654au_0_pon_pwrkey: pwrkey {
+				compatible = "qcom,pmk8350-pwrkey";
+				interrupts-extended = <&spmi_bus 0x0 0x12 0x7 IRQ_TYPE_EDGE_BOTH>;
+				linux,code = <KEY_POWER>;
+				debounce = <15625>;
+			};
 		};
 	};