arm64: dts: qcom: pmi8994: Define MPP block

The pmi8994 has 4 multi-purpose-pins, add these to the definition.
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Dylan Van Assche <me@dylanvanassche.be>
Link: https://lore.kernel.org/r/20220505022706.1692554-4-bjorn.andersson@linaro.org

arch/arm64/boot/dts/qcom/pmi8994.dtsi

@@ -19,6 +19,16 @@ pmi8994_gpios: gpios@c000 {
 			interrupt-controller;
 			#interrupt-cells = <2>;
 		};
+
+		pmi8994_mpps: mpps@a000 {
+			compatible = "qcom,pmi8994-mpp";
+			reg = <0xa000>;
+			gpio-controller;
+			gpio-ranges = <&pmi8994_mpps 0 0 4>;
+			#gpio-cells = <2>;
+			interrupt-controller;
+			#interrupt-cells = <2>;
+		};
 	};
 
 	pmic@3 {