Deprecate BIND_ALLOW_FOREGROUND_SERVICE_STARTS_FROM_BACKGROUND

We no longer use it. The "allowed to start FGS" state is now implicitly
propagated across service bindings. We just couldn't remove it for S in time..

Bug: 189235490
Test: prebuilt
Change-Id: Ib53e2cdf45a10454ccf042828ad4219e480ee3ef
2 files changed