V4L/DVB: tvp7002.c: Add support for enum_dv_presets

Implement enum_dv_presets in tvp7002.

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