Add MRR guard logic to SF scheduler

Uses a flag to guard the new dVRR scheduler features
from MRR devices. This is to easily allow development on
dVRR devices and MRR devices separately.

Bug: 330224639
Test: atest libsurfaceflinger_unittest
Test: atest CtsSurfaceControlTestsStaging
Test: dumpsys and observe no category or GTE
Change-Id: I8be520b5630c1a8fbde5f0fb2265e803e46983a8