msm: camera: crm: Clean up the link handles on session destroy

It is possible that while the session is being destroyed, e.g., when
the v4l2 device is closed, the session object has link objects that
have not been unlinked. Clean up all the active link handles when
destroying the session.

Change-Id: Ie213b5fe090fd01ea7d552f534def84161cf3f10
Signed-off-by: Sunil Khatri <sunilkh@codeaurora.org>
Signed-off-by: Lynus Vaz <lvaz@codeaurora.org>