Remove db rows after unlinking the file from ROOT_UID

File path operations from ROOT_UID will not insert/update/delete
database rows. Hence, in this CL, after unlinking the file, we scan the
file to remove db row of the deleted file.

Bug: 159565500
Test: atest CtsScopedStorageHostTest
Tets: atest CtsScopedStoragePublicVolumeHostTest
Change-Id: Ibb7f2ecf253ac6625211f78b0a125f59a71198eb
2 files changed