Make toolkit_frame_rate_function_enabling_read_only only avoid calls to

SurfaceFling

Use toolkit_frame_rate_function_enabling_read_only to only gate the
setFrameRate and setFrameRateCategory calls, and
toolkit_frame_rate_view_enabling_read_only to gate the changes by made
Toolkit for VRR.

Test: atest ViewRootImpl / ViewFrameRateTest / ViewTest
Change-Id: I6a10dc44f61501dc5e9293c6b240d46c79e25736