Disable VR compatibility display

The VR compatibility display is causing issues with the 2d <--> VR
transition in SurfaceFlinger. Disable it until we figure out what's
going on.

Bug: 34280358

Test: Had flakiness when transitioning into/out of VR mode via cube sea
and treasure hunt, with the VR compatibility display enabled. After
disabling the VR compatibility display, transitioning was much more
stable, though not perfect.

Change-Id: I7822fff2095e4bb8eb0b4157c0d9fd06e99f48c8