media: ov8865: move mode_configure out of state_configure

ov8865_mode_configure() only needs to be called on sensor init, but it can
be called multiple times from ov8865_state_configure(). Move
ov8865_mode_configure() to ov8865_sensor_init().

Signed-off-by: Allen Ballway <ballway@chromium.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>