Our packet filters use mbuf's rcvif pointer to determine incoming interface.
Change mbuf's rcvif to enc0 and restore it after pfil processing.

PR:		110959
Sponsored by:	Yandex LLC


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272695 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f