MFC r238718: Quirk MS keyboard so that function keys work

MFC r238718: Quirk MS keyboard so that function keys work

  The function keys on a Microsoft Natural Egronomic Keyboard 4000 have been
  repurposed as "Help", "Undo", "Redo" etc., and a special "F Lock" key is
  required to return them to their normal purpose.

  This change enables the UQ_KBD_BOOTPROTO quirk for the MS Natural 4000
  keyboard to get the keys working again.  More extensive changes to the USB
  keyboard infrastructure would be needed to fully support the "F Lock" mode
  and the extended keys on this keyboard.

PR:             usb/116947
Approved by:	re

git-svn-id: svn://svn.freebsd.org/base/releng/9.1@239492 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f