sdm: Drop HW VSYNC in min FPS state.

-Do not send HW VSYNC to SF in min FPS state
 until a commit is received. If HW VSYNC is
 sent to SF in min FPS state, this cause SW
 VSYNC in SF to first adjust to min FPS
 initially, and then after commit SW VSYNC again
 adjusts to max FPS.

Change-Id: I47ec673e68c4eae643103ebfb2009fb96f6934f3
CRs-Fixed: 2192683
5 files changed