Merge r223566 from head:

Merge r223566 from head:

  The SMCWUSBG is a zyd(4) device, not an uath(4) device.  Remove from
  the latter.

  It appears that the addition to uath(4) came in through PR kern/135009,
  which had tested another device, the SMCWUSBTG2, successfully with
  uath(4) and included the SMCWUSBG as it "has the same chipset".  I can
  find no other evidence that these two do actually share the same chipset.
  Moreover, Linux treats the SMCWUSBG as a zyd(4) device also.

This is a partial merge, as it appears that the kernel parts of r223566
were already merged in r223605.

Discussed with:	hselasky, kevlo

git-svn-id: svn://svn.freebsd.org/base/stable/8@226328 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f