msm: camera: Add actuator driver

Add actuator driver that is responsible to move the actuator lens
for auto focus functionality. Register platform driver and create
v4l2 subdevice during probing. Add config functions for power up,
power down and move focus.

Change-Id: Icabf5dbd88fa64ea0a007834ffdd7a2b81eae567
Signed-off-by: Sreesudhan Ramakrish Ramkumar <srramku@codeaurora.org>
[smuckle@codeaurora.org: backported from msm-3.7]
Signed-off-by: Steve Muckle <smuckle@codeaurora.org>
9 files changed