V4L/DVB (4805): Dib0700: Add support for Leadtek Winfast DTV Dongle (STK7700P based)

This patch adds support for the new, STK7700-based revision
of the Leadtek Winfast DTV Dongle.

Signed-off-by: Michal CIJOML Semler <cijoml@volny.cz>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>