net/mlx4: remove useless compilation checks

net/mlx4: remove useless compilation checks

Verbs support for RSS, inline receive and extended device query calls has
not been optional for a while. Their absence is untested and is therefore
unsupported.

Remove the related compilation checks and assume Mellanox OFED is up to
date, as described in the documentation.

Use this opportunity to remove a few useless data path debugging messages
behind compilation checks on never defined macros.

Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>