Add RSE support for update() and delete().

We already had RSE support in place for opening a file for write
access, but this change adds support for update() and delete() too,
along with tests to verify for all common collections.

Bug: 129014648
Test: atest android.appsecurity.cts.ExternalStorageHostTest
Exempt-From-Owner-Approval: trivial test change
Change-Id: Iffda1da02578e15888b916898f0f066e979d8d09
3 files changed