Adding new SYSTEM_REQUESTED priority to DisplayModeDirector voting

Added new SYSTEM_REQUESTED_MODE priority
Added new Vote type
Renamed SupportedModesVote to SupportedRefreshRatesVote to better reflect its purpose

Test: atest VotesStorageTest atest VoteSummaryTest, atest DisplayModeDirectorTest, atest SupportedModesVoteTest
Bug: b/309466682
Change-Id: I41237a993a8b53cc65026719f605501578369b2f
21 files changed