[media] solo6x10: move global fields in solo_dev_fh to solo_dev

All fields in solo_dev_fh do not belong there since they refer to global
properties. After moving all these fields to solo_dev the solo_dev_fh
struct can be removed completely.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>