Allow apexd to snapshot and restore DE data.

This calls into apexd to allow it to snapshot and restore DE apex data
in the case of a rollback. See the corresponding apexd change for more
information.

Cherry-pick from (unsubmitted) internal CL: ag/10163227

Bug: 141148175
Test: atest StagedRollbackTest#testRollbackApexDataDirectories_DeSys
Change-Id: Ia4bacc9b7b7a77038ba897acbc7db29e177a6433
1 file changed