SF: enable high refresh rate virtual mode

Add support for SF backdoor to set a multiplier
and divisor on the period for VSYNC-sf and
VSYNC-app from the primary DispSync object.

Bug: 111549030
Test: enable high refresh rate in devOptions and
view with systrace

Change-Id: I4226d5791d8d7ddeae1ad96577713c9c2141ed58
5 files changed