Disable early hint in SurfaceFlinger adpf cpu hints by default

Early hint for SurfaceFlinger currently does not provide enough value
and needs more tweaking to be viable, so this patch disables it
by default for the feature rollout.

Bug: b/239730433
Test: manual
Change-Id: I48387f5a14b242e8b9fb5c7dfbc3d041c303eb71
(cherry picked from commit 58a36454)