media: imx-mipi-csis: Add num_data_lanes to mipi_csis_device

media: imx-mipi-csis: Add num_data_lanes to mipi_csis_device

Add the num_data_lanes field to the mipi_csis_device struct, and set it
equal to csis->bus.num_data_lanes. This is in preparation to support
cases when the data lanes actively used differs from the maximum
supported data lanes.

No functional changes intended by this commit.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Isaac Scott <isaac.scott@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>