PerfMonKernel: Cleanup legacy code
This MR is a follow up to !75234 (merged) and cleans the legacy PerfMon
infrastructure from PerfMonKernel
.
Related to ATEAM-989
This MR is a follow up to !75234 (merged) and cleans the legacy PerfMon
infrastructure from PerfMonKernel
.
Related to ATEAM-989