msm: camera: Actuator i2c interface changes

Change actuator i2c interface to handle delay within utility funcion.
In future platform, delay will be handled by lower i2c layer. Hence
actuator driver need not handle it.

Change-Id: I39088c20c2a4b38b2a50c6e7e79a29668d8016c1
Signed-off-by: Sreesudhan Ramakrish Ramkumar <srramku@codeaurora.org>