media: imx-jpeg: Account for data_offset when getting image address

Applications may set data_offset when it refers to an output queue. So
driver need to account for it when getting the start address of input
image in the plane.

Meanwhile the mxc-jpeg codec requires the address (plane address +
data_offset) to be 16-aligned.

Fixes: 2db16c6e ("media: imx-jpeg: Add V4L2 driver for i.MX8 JPEG Encoder/Decoder")
Signed-off-by: Ming Qian <ming.qian@oss.nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>