[media] go7007-loader: renamed from s2250-loader

All s2250 names are renamed to go7007. This will be the generic go7007
firmware loader for any go7007 device, not just for the s2250/1.

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