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ifconfig: add setifcapnv()

Description

ifconfig: add setifcapnv()

which uses SIOCSIFCAPNV to set arbitrary string-named interface
capability.

Reviewed by: hselasky, jhb, kp
Sponsored by: NVIDIA Networking
MFC after: 3 weeks
Differential revision: https://reviews.freebsd.org/D32551