msm: camera: add a variable to take direction register value

Add a variable to take direction register value from user space.
Direction register value is required during lens reset function
of the actuator.

Change-Id: Iebe362c514602247bced18d994cce41288f34565
Signed-off-by: Soundrapandian Jeyaprakash <jsoundra@codeaurora.org>
Signed-off-by: Xu Han <hanxu@codeaurora.org>