ov8830: temporary: add device registration

ov8830: temporary: add device registration

BZ: 16972

Device firmware SFI table does not yet define ov8830 device.
Add the driver by explicitly registering it in the kernel platform code.

This patch is temporary. It should be reverted when SFI contains
the device.

Change-Id: I57f472d1cc8f14e66858382de493c5400915d509
Signed-off-by: Tuukka Toivonen <tuukka.toivonen@intel.com>
Reviewed-on: http://android.intel.com:8080/32617
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>