V4L/DVB (8089): cx18: add support for Conexant Raptor PAL/SECAM card

Patch provided courtesy of Conexant http://www.conexant.com

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Signed-off-by: Srinivasa Deevi <srinivasa.deevi@conexant.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>