sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

mlx5: idiomatic use of preprocessor, in particular paths

MFC after: 1 week
Sponsored by: NVIDIA Networking

mlx5: normalize use of the opt_*.h files

MFC after: 1 week
Sponsored by: NVIDIA Networking

mlx5: Numa domain improvements.

Properly allocate all mlx5en(4) structures from correct numa domain.

While at it cleanup unused numa domain integers deriving from the
Linux version of mlx5en(4).

MFC after: 1 week
Reviewed by: kib
Sponsored by: Mellanox Technologies // NVIDIA Networking

Use the busdma API to allocate all DMA-able memory.

The MLX5 driver has four different types of DMA allocations which are
now allocated using busdma:

1) The 4K firmware DMA-able blocks. One busdma object per 4K allocation.
2) Data for firmware commands use the 4K firmware blocks split into four 1K blocks.
3) The 4K firmware blocks are also used for doorbell pages.
4) The RQ-, SQ- and CQ- DMA rings. One busdma object per allocation.

After this patch the mlx5en driver can be used with DMAR enabled in
the FreeBSD kernel.

MFC after: 1 week
Sponsored by: Mellanox Technologies

Add mlx5 and mlx5en driver(s) for ConnectX-4 and ConnectX-4LX cards
from Mellanox Technologies. The current driver supports ethernet
speeds up to and including 100 GBit/s. Infiniband support will be
done later.

The code added is not compiled by default, which will be done by a
separate commit.

Sponsored by: Mellanox Technologies
MFC after: 2 weeks