V4L/DVB (5669): Budget-av: Add support for EasyWatch DVB-S (0x1894:0x001b)

Add support for Satelco EasyWatch PCI DVB-S card (subsystem 0x1894:0x001b).

Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>