[media] tvp7002: use dv_timings structs instead of presets

In the functions tvp7002_mbus_fmt(), tvp7002_log_status and tvp7002_probe()
we should use the dv_timings data structures instead of dv_preset data
structures and functions.
This is the second step towards removing the deprecated preset support of this
driver.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Lad, Prabhakar <prabhakar.lad@ti.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>