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System wide and NUMA domain wide counters support. PMC classes for ARM DMC-620…

Description

System wide and NUMA domain wide counters support. PMC classes for ARM DMC-620 and CMN-600.

Add support for system wide and NUMA domain wide counters support.
Add 3 new PMC classes for ARM DMC-620 and CMN-600 controllers PMU.

Reviewed by: mhorne
Sponsored By: ARM
Sponsored By: Ampere Computing
Differential Revision: https://reviews.freebsd.org/D35342