msm: camera: sync:Cleanup sync object link properly

During the sync object deinit, it is only cleaning sync object
to parent object link and sync object to child object links.
Child object has link to parent point sync object.
Sync object parent also has child link point to sync object.
This links need to be clean up properly.

Change-Id: If8b2b303048d18d5bbf10179ea6bdfdda7151ff8
Signed-off-by: Ravikishore Pampana <rpampana@codeaurora.org>