[media] vsp1: Use the maximum number of entities defined in platform data

The VSP1 driver allows to define the maximum number of each module
such as RPF, WPF, and UDS in a platform data definition.
This suppresses operations for nonexistent or unused modules.

Signed-off-by: Katsuya Matsubara <matsu@igel.co.jp>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>