[Differential] D9345: ifnet: move the new ifnet_event EVENTHANDLER_DECLARE to net/if_var.h

[sepherosa_gmail.com (Sepherosa Ziehau)]

sepherosa_gmail.com accepted this revision.

REVISION DETAIL
  https://reviews.freebsd.org/D9345

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To: decui_microsoft.com, hselasky, cem, np, kmacy, kib, honzhan_microsoft.com, howard0su_gmail.com, jhb, ae, delphij, royger, gnn, rwatson, David_A_Bright_DELL.com, glebius, sepherosa_gmail.com
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