V4L/DVB (5431): Cx88: autodetect ADS Tech InstantTV DVB-S

The ADS Tech InstantTV DVB-S is a clone of the KWorld DVB-S 100.
This patch adds autodetection support for this card based on
pci subsystem id.

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>