arm64: dts: allwinner: h5: Fix PMU compatible

The commit c35a516a ("arm64: dts: allwinner: H5: Add PMU node")
introduced support for the PMU found on the Allwinner H5. However, the
binding only allows for a single compatible, while the patch was adding
two.

Make sure we follow the binding.

Fixes: c35a516a ("arm64: dts: allwinner: H5: Add PMU node")
Signed-off-by: Maxime Ripard <maxime@cerno.tech>

arch/arm64/boot/dts/allwinner/sun50i-h5.dtsi

@@ -38,8 +38,7 @@ cpu3: cpu@3 {
 	};
 
 	pmu {
-		compatible = "arm,cortex-a53-pmu",
-			     "arm,armv8-pmuv3";
+		compatible = "arm,cortex-a53-pmu";
 		interrupts = <GIC_SPI 116 IRQ_TYPE_LEVEL_HIGH>,
 			     <GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>,
 			     <GIC_SPI 118 IRQ_TYPE_LEVEL_HIGH>,