msm: camera: Correct driver removal operations for sensor modules

Driver removal function should clear all data and unregister itself
as v4l2 subdev. This change adds clearing all remained data along with
unregister itself as a v4l2 subdev in order to support clean probe
in future.

Change-Id: I23c0389029b5a3eac0552990afae49da3bb11c92
Signed-off-by: Jigarkumar Zala <jzala@codeaurora.org>
Signed-off-by: Vishalsingh Hajeri <vhajeri@codeaurora.org>