DP_04_002 - Perf event discovery/encoding from json file

Currently, perf event discovery happens through DT node parsed by the M-mode firmware. Once we have counter delegation in place, we need to discover this via perf json file.

Counter delegation specification:
https://docs.google.com/document/d/1s-GeH5XpHBLzbQZucA8DPA7vvF7Xvf_nrPbrU2YLBcE/edit

Dependency	Counter delegation specification & PoC
Development	DONE	URL: NA
Development Timeline	Q1 2024
Upstreaming	IN PROGRESS	URL: NA
Upstream Version	---
Contacts	Atish Patra

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