Process mirrorSurfaceControl on the main thread

As for the other surface-related events, the simplest approach to avoid
race conditions (e.g. use after release) is to block the binder thread
and do checks + SurfaceControl.mirrorSurface on the main threads.

Flag: EXEMPT bugfix
Bug: 409713395
Test: presubmit
Change-Id: I0efc56d6d56a65be7043e4e9f5567fe96032ae25