OPP: Initialize OPP FileProvider after user unlock
* The FileProvider used by Bluetooth OPP profile used to be initialized
before user unlock, resulting in file system access errors since
credential encrypted volumes are not mounted and unlocked yet
* Incomplete initialization also leads to NPE when getUriForFile is
called
* This change adds BluetoothOppProvider that only initializes after user
unlocks the device
Bug:
36274847
Test: make, Opp regression test
Change-Id: I323b9084de1ff72922c4dd9866c36dd172696a8f
(cherry picked from commit
a19f73959d7e054b206633aa1592a874d0d623f2)
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