[media] v4l: vsp1: Factorize get pad format code

All entities implement the same get pad format handler, factorize it
into a common function.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
9 files changed