Fix an apparent conversion error in bge to the new driver api.
if_multiaddr_array() does the LLADDR work, don't do it twice.

This broke IPv6 in "interesting" ways in the FreeBSD.org cluster.
o Enable GPIO device driver for i.MX6.
  It was originally written for i.MX5 and compatible with newer chip.
o Extend device tree information
o style(9) fixes

Discussed with:	ian
Rename gpio driver file.
Fix typo.