V4L/DVB (6319): radio-gemtek: fix 'VID_HARDWARE_GEMTEK' undeclared

Remove obsolete V4L v1 reference.

Thanks to Ingo Molnar for pointing this issue.

Signed-off-by: Pekka Seppänen <pexu@kapsi.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>