Fix locking issue by short-circuiting feature

This is a temporary fix to avoid holding the PackageManagerService.mLock
while querying the DeviceConfig provider, which then attempts to acquire
the same lock. A subsequent CL will provide a correct and longer term
fix.

Fixes: 139348423
Test: atest AppsFilterTest
Change-Id: I4422fbb51d23e276c26cc9d8ba48783e7c5e53ff