Implement game mode framerate override

Add logic for setting throttling framerate requested
by Game Dashboard interventions.

- Refactored of FrameRateOverrideMappings in Scheduler
- Have mSupportsFrameRateOverride only guard mFrameRateOverrideByContent
- Remove logic that disables framerate override when it's not a divider

Bug: b/204322816
Test: atest FrameRateOverrideHostTest

Change-Id: I1a2caf378cd87ce4830f6fc48332b5df518330cc