API cleanup: add boolean param to setEnableRollback

Mark PackageInstaller.SessionParams#setEnableRollback() as @removed and
@deprecated.
Add PackageInstaller.SessionParams#setEnableRollback(enable).
Replace old API usages in RollbackTestUtils with the new API.

Also, add PackageInstaller.SessionInfo#getEnableRollback().

Fixes: 127282838
Test: atest RollbackTest
Change-Id: I696680207be5ac06560d2abb525f91a100301b4c
4 files changed