ethdev: deprecate hard-to-use or ambiguous items and actions

ethdev: deprecate hard-to-use or ambiguous items and actions

PF, VF and PHY_PORT require that applications have extra
knowledge of the underlying NIC and thus are hard to use.
Also, the corresponding items depend on the direction
attribute (ingress / egress), which complicates their
use in applications and interpretation in PMDs.

The concept of PORT_ID is ambiguous as it doesn't say whether
the port in question is an ethdev or the represented entity.

Items and actions PORT_REPRESENTOR, REPRESENTED_PORT
should be used instead.

Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru>
Acked-by: Ori Kam <orika@nvidia.com>
Acked-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>