DO NOT MERGE: SF: disable HW vsync while dozing

It cancels any in-progress resync when display goes to sleep, then
it avoids any unexpected wake up due to delayed frames once device
has just switched to ambient mode.

In DOZE_SUSPEND, screen displays a still image in a self-refresh mode,
so there is no need to keep aligned with HW vsync. At the opposite, DOZE
mode is used to refresh the screen in Ambient (i.e. watchface refresh,
nofications, app updates in ambi-active), hence resync SF to HW vsync.

Bug: 35998607
Bug: 36215242
Change-Id: I22cd8f84e9aca04b4f657fe07785751cf31a7c68