FGS BG start restriction enforcement mode.

Change the "FGS background start while-in-use permission restriction"
feature from permissive mode to enforcement mode, which means, the
restriction is turned on.

It denies while-in-use location, camera, record_audio permissions in
foreground service started from background ("Always" permissions are
not denied).

Bug: 136219221
Test: atest android.app.cts.ActivityManagerProcessStateTest

Change-Id: If6bf8309f5af8210ee536fdd484d7e17d0dc12c5