[media] v4l: mt9p031/mt9t001: Use i2c_smbus_{read|write}_word_swapped()

[media] v4l: mt9p031/mt9t001: Use i2c_smbus_{read|write}_word_swapped()

The MT9P031 and MT9T001 sensors transfer 16-bit data on the I2C bus in
swapped order. Let the I2C core handle byte order by using the
i2c_smbus_{read|write}_word_swapped() functions.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>