ARM: dts: qcom-pm8841: add interrupt controller properties

Now that the pmic-mpp is a proper hierarchical IRQ chip, add interrupt
controller properties ('interrupt-controller' and '#interrupt-cells').
The interrupts property is no longer needed so remove it.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211008012524.481877-22-dmitry.baryshkov@linaro.org

arch/arm/boot/dts/qcom-pm8841.dtsi

@@ -16,10 +16,8 @@ pm8841_mpps: mpps@a000 {
 			gpio-controller;
 			#gpio-cells = <2>;
 			gpio-ranges = <&pm8841_mpps 0 0 4>;
-			interrupts = <4 0xa0 0 IRQ_TYPE_NONE>,
-				     <4 0xa1 0 IRQ_TYPE_NONE>,
-				     <4 0xa2 0 IRQ_TYPE_NONE>,
-				     <4 0xa3 0 IRQ_TYPE_NONE>;
+			interrupt-controller;
+			#interrupt-cells = <2>;
 		};
 
 		temp-alarm@2400 {