linux(4): Fixup the interface name translation in netlink

Netlink should translate a FreeBSD interface name to a Linux
interface name.

Approved by: re (cperciva)
Reviewed by: melifaro
Differential Revision: https://reviews.freebsd.org/D38715
MFC after: 3 days

(cherry picked from commit e55e4a6ba3f4cd31d47b74574ea7370d5ab14b48)
(cherry picked from commit 123ca9ab11896f356245537ee41207fb6943fccd)