mlx4/mlxen: update version to 2.1.6

[markb_mellanox.com]

Summary

Update code base to latest version.

Sponsored by: Mellanox Technologies
Signed-off-by: Mark Bloch <[e-mail]>

[• hselasky]

utils.c is already in kern/uipc_mbufhash.c see m_ether_tcpip_hash() .

[markb_mellanox.com]

In D4283#90260, @hselasky wrote:

utils.c is already in kern/uipc_mbufhash.c see m_ether_tcpip_hash() .

On 11, but on 10 we still don't have it.
There is a compile time check (in the Makefile) if to build uitls.{c,h} or not.

Seeing as we want to MFC it at some point, it will be easier this way.

[• hselasky]

I see some whitespace and other minor style issues I'll fix before committing. Looks good.