Send load reset hint from SF in advance of frame

Send a load reset hint from SF to wake the session, to help move
responsibility for this to individual sessions and away from
DISPLAY_UPDATE_IMMINENT.

Bug: b/256918431
Test: atest libsurfaceflinger_unittest
Change-Id: I5a3c04682993866d9c0b4531ab69cfb903500813
6 files changed