powerhint: Add Display refresh rate hint, DISPLAY_IDLE and DISPLAY_UPDATE_IMMINENT

Add display refresh rate changed hints:
REFRESH_120FPS
REFRESH_90FPS
REFRESH_60FPS

For DISPLAY_IDLE hint, set TAUClampBoost to 0.
Then for DISPLAY_UPDATE_IMMINENT and INTERACTION, set TAUClampBoost back to default.

Bug: 170648686
Bug: 170508822
Test: `watch -n 1 adb shell cat /dev/cpuctl/top-app/cpu.uclamp.min`
Change-Id: I18fd6d4257f8902ddbbdb3ed4a20b88d5cc43a2c
3 files changed