if_re: add Realtek Killer Ethernet E2600 IDs
PR: 274292
MFC after: 1 week
Reviewed by: kp
Event: Oslo Hackathon at Modirum
(cherry picked from commit 3c871489cdd6c5606b2b1125f66b0e9b8f39561f)
(cherry picked from commit 50cf84e93c5be087316da4495395b66793fe80d9)
Approved by: re (gjb)