Add Support for Virtual High Refresh Rate mode

Add a developer options settings switch to enable a virtual
HiFrequency panel mode to be able to test the SW stack with
display running at 50% faster than the default refresh
rate.

Bug: 111549030
Test: Enable HiFrequency mode and use systrace/adb to verity
Change-Id: Ibfd30ca1a14a146419233eaefa9b5095bf459adc