mlx.4: Improve HARDWARE

These are paralel scsi adapters, list what kind the hardware supports.

MFC after: 3 days
Fixes: e3307d05311e8c (mlx.4: Improve specificity)
Reported by: kbowling
Reviewed by: kbowling
Approved by: mhorne (mentor, implicit)
Differential Revision: https://reviews.freebsd.org/D50654