FreeBSD_STABLE_11-arm64 - Build #155 - Fixed

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FreeBSD_STABLE_11-arm64 - Build #155 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_STABLE_11-arm64/155/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_STABLE_11-arm64/155/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_STABLE_11-arm64/155/console

Change summaries:

306060 by karels:
MFC r304713:

  Fix L2 caching for UDP over IPv6

  ip6_output() was missing cache invalidation code analougous to
  ip_output.c. r304545 disabled L2 caching for UDP/IPv6 as a workaround.
  This change adds the missing cache invalidation code and reverts
  r304545.

  Reviewed by:    gnn
  Approved by:    gnn (mentor)
  Tested by:      peter@, Mike Andrews
  Differential Revision:  https://reviews.freebsd.org/D7591