ci: enable more drivers in Travis builds

ci: enable more drivers in Travis builds

The Travis compilation is missing some dependencies to build all PMDs.
More PMDs are enabled in Travis which runs Ubuntu Bionic Beaver (18.04):
	- ipn3ke (libfdt)
	- mlx (libibverbs)
The next Ubuntu LTS, Focal Fossa (20.04) will allow to support more:
	- af_xdp (libbpf)
	- Intel crypto (libipsec-mb 0.53)

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Acked-by: Aaron Conole <aconole@redhat.com>
Acked-by: David Marchand <david.marchand@redhat.com>