redfin: add display fps deferral

The FPS deferral property allows deferring clock/bandwidth votes
when switching from high refresh rate to low in case hardware
takes some extra time to change refresh rate.

Bug: 152468927
Bug: 154607334
Test: 60/90 switching, no noise line
Test: systrace to check vsync period
Change-Id: I47284578d13c203b14b3213081faf258dd9a542b