media: ti-vpe: cal: Add comments to cal_probe() to delimitate sections

media: ti-vpe: cal: Add comments to cal_probe() to delimitate sections

The cal_probe() function is a bit long, add comments to delimitate
sections in order to improve readability. The platform_set_drvdata()
call is moved to a more logical place as a result.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>