media: rcar-vin: Specify media device ops at group creation time

The media device operations structure will be different depending on
what media graph layout is used. Instead of hard-coding the R-Car CSI-2
layout allow the operations to be passed as an argument.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>