[Bug 205050] VLAN_MTU required by smsc driver

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205050

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: hselasky
Date: Mon Dec  7 18:55:33 UTC 2015
New revision: 291953
URL: https://svnweb.freebsd.org/changeset/base/291953

Log:
  When setting up VLANs on a Raspberry Pi ethernet port, the MTU drops
  from 1500 to 1496 bytes. The MTU should remain at 1500, extending the
  frame size as per IEEE 802.3. Adding IFCAP_VLAN_MTU to the
  if_capabilities field in the smsc driver solves the problem.  The
  datasheet for the LAN9512 chip, section 3.2.3 states that the chip
  supports the extended frame.

  Submitted by:    rpp at ci.com.au
  MFC after:    1 week
  PR:        205050

Changes:
  head/sys/dev/usb/net/if_smsc.c

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