V4L/DVB (13082): em28xx: remove "not validated" status from Terratec Cinergy T XS (005e)

The board support has been validated by the user, so get rid of the warning
that shows up on board load.

Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>