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>