[VRR] Don't have ScreenDecorHwcOverlay vote for frame rate

Fixes: 338125263
Flag: ACONFIG android.view.flags.toolkit_set_frame_rate_read_only TRUNKFOOD

ScreenDecorHwcOverlay was voting HIGH for frame rate and it should
not vote at all. This CL makes it not vote.

Test: manual

Change-Id: Id9f7ae67c819f31d4c3fc46cb77683a1a4d8fb5d
1 file changed