SF: Short-circuit scheduler content detection

Avoid registering, recording, partitioning, and transforming layers
for content detection in the scheduler if there is a single refresh
rate config.

Dump content detection version, and layer history stats.

Bug: 158780872
Test: No layer history on crosshatch, ARC, etc.
Test: dumpsys SurfaceFlinger --vsync
Test: libsurfaceflinger_unittest
Change-Id: Ia23a35cd6aa0cb117b19c98f5d0af8c14836430e