V4L/DVB (10716): zoran: change buffer defaults to something that works with tvtime

By popular request increased the default number and size of the buffers
to something that tvtime likes.

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