ov8830: add initial driver for drv201 AF actuator into ov8830 driver

ov8830: add initial driver for drv201 AF actuator into ov8830 driver

BZ: 27473

Add initial support for drv201 AF actuator into the ov8830 driver.
The drv201 code should be moved into a separate driver later on,
so prefix all functions related to the drv201 with drv201.

Change-Id: I06d4c7c86279c5f0280a9fe7adc1077c49c65c75
Signed-off-by: Tuukka Toivonen <tuukka.toivonen@intel.com>
Reviewed-on: http://android.intel.com:8080/41354
Reviewed-by: Cohen, David A <david.a.cohen@intel.com>
Reviewed-by: Koski, Anttu <anttu.koski@intel.com>
Tested-by: Koski, Anttu <anttu.koski@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>