fix(pmu): switch FVP PMUv3 SPIs to PPI

FVP PMUv3 SPIs legacy interrupts are only listed for
cluster #0 and are missing for cluster #1.
This patch changes FVP SPIs to PMUv3 PPI as in
arm_fpga.dtsi, morello.dtsi and n1sdp.dtsi.

Signed-off-by: AlexeiFedorov <Alexei.Fedorov@arm.com>
Change-Id: Ic624cec09ba932666c746ae1a6a4b78b6decde96

fdts/fvp-base-psci-common.dtsi

@@ -186,10 +186,7 @@
 
 	pmu {
 		compatible = "arm,armv8-pmuv3";
-		interrupts = <GIC_SPI 60 IRQ_TYPE_LEVEL_HIGH>,
-			     <GIC_SPI 61 IRQ_TYPE_LEVEL_HIGH>,
-			     <GIC_SPI 62 IRQ_TYPE_LEVEL_HIGH>,
-			     <GIC_SPI 63 IRQ_TYPE_LEVEL_HIGH>;
+		interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_HIGH>;
 	};
 
 	panel {