V4L/DVB (3201): Remove #ifdef BTTV_BOARD_TWINHAN_VP3021

- As far back as the video4linux cvs repository goes, there is no mention
of BTTV_TWINHAN_VP3021.  It seems that this was done for the sake of
backwards compatability with some older v4l, but this can no longer be
necessary due to the v4l/dvb cvs merger, nor should this have ever
existed in the upstream kernel.

Signed-off-by: Michael Krufky <mkrufky@m1k.net>
Acked-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>