media: vivid: fix missing cec adapter name

Commit "vivid: reorder CEC allocation and control set-up" missed that the CEC adapter
needs a valid vfd->name, and that was now filled in after the CEC adapter was
created, leading to an empty adapter name.

Fill in the name earlier.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Fixes: 4ee895e7

 ("media: vivid: reorder CEC allocation and control set-up")
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>