SurfaceView: Don't reparent SurfacePackage on release

There is no need to reparent the SurfacePackage to null, if the
SurfaceView is destroyed it will naturally die, if it's not it will
persist which actually may be the intended behavior if we are
in some sort of exiting state. More so, it creates possible confusion
around releasing one SurfaceView while reparenting the SurfacePackage
to another.

Bug: 196926363
Bug: 217973491
Test: SurfaceViewSurfacePackageValidatorTest#testSurfacePackageNoFlicker
Change-Id: I4f93c4a6928f6b47371d0a264f1fc99c4e82819f