SF: Disallow VSYNC injection outside tests

Besides sffakehwc_test, VSYNC injection is used by surfacereplayer, an
abandoned debug tool that already requires hacking up the build to run.

Bug: 150226265
Test: Enable VSYNC injection with ACCESS_SURFACE_FLINGER permission.
Test: sffakehwc_test
Change-Id: Id6ebaacfa9ea11163560265fdf59625abd23aeb5
2 files changed