Added support for nGene based Media-Pointer DVB-S2 twin tuner cards.

[mchehab@redhat.com: Fix compilation error: unknown field ‘ref_clk’]
Signed-off-by: Matthias Benesch <twoof7@freenet.de>
Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>