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Enable Fastchannel and DVFS to support ACPI CPPC for RD-V1 and RD-N2.

Darryl Green requested to merge github/fork/Pranav-Madhu/topics/rd-cppc into master

Created by: Pranav-Madhu

Collaborative Processor Performance Control (CPPC) describes a mechanism for the OS to manage the performance of a processor on a contiguous and abstract performance scale. This patch series add platform firmware changes required to support CPPC functionality for RD-N2 and for RD-V1. This includes enable DVFS framework for frequency control, enable fastchannel as a communication medium between the OS running on AP core and the platform firmware etc.

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