media: imx: imx7_mipi_csis: Pass csi_state to mipi_csis_subdev_init()

Pass the csi_state pointer to the mipi_csis_subdev_init() function,
instead of miscellaneous information scattered in different arguments.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Rui Miguel Silva <rmfrfs@gmail.com>
Tested-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>