[media] tvp7002: remove dv_preset support

Finally remove the dv_preset support from this driver. Note that dv_preset
support was already removed from any bridge drivers that use this i2c
driver, so the dv_preset ops were no longer called and can be removed
safely.

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>