Performance monitor support

• HiSilicon SoC uncore Performance Monitoring Unit (PMU)
• Freescale i.MX8 DDR Performance Monitoring Unit (PMU)
• Qualcomm Technologies Level-2 Cache Performance Monitoring Unit (PMU)
• Qualcomm Datacenter Technologies L3 Cache Performance Monitoring Unit (PMU)
• ARM Cache Coherent Network
• Arm Coherent Mesh Network PMU
• APM X-Gene SoC Performance Monitoring Unit (PMU)
• ARM DynamIQ Shared Unit (DSU) PMU
• Cavium ThunderX2 SoC Performance Monitoring Unit (PMU UNCORE)