libsnapuserd: Pause/Resume Snapshot merge

Add API to support pause and resume of snapshot merge

Bug: 386142969
Test: Reboot device when snapshot merge is in progress
Change-Id: I6d1e36895a6b1b14a4e915d16afbd844a14f6175
Signed-off-by: Akilesh Kailash <akailash@google.com>
9 files changed