This driver was for an early and uncommon legacy PCI 10GbE for a single ASIC, Intel 82597EX. Intel quickly shifted to the long lived ixgbe family.
Relnotes: Yes
Justification: removing this will aid in network device API cleanup in FreeBSD 12 and later. This driver is not maintained, low in performance, high in power use, and the HW is too scarce to obtain for test and continued support.