doc: announce driver name changes

Driver names for all the supported devices in DPDK do not have
a naming convention. Some are using a prefix, some are not
and some have long names. Driver names are used when creating
virtual devices, so it is useful to have consistency in the names.

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
Acked-by: Thomas Monjalon <thomas.monjalon@6wind.com>
Acked-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Acked-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>