V4L/DVB (4259): Pass an explicit log prefix to cx2341x_log_status

A card number is not unique enough. Instead, let the caller specify the
prefix of the status messages.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>