Reformat existing LGPL copyright notices.

Update files that already had the new-style LGPL copyright notice to
match what the new copyright script expects (slightly different author
list).  Generated kernels need a somewhat separate approach, so skipped
in this change.

Applied with
  git ls-tree --name-only -r HEAD | git check-attr filter --stdin | \
  sed -Ene '/(copyright|uncrustify)$/ {s/:.*//;p;}' | \
  grep -v '_kernel_' | xargs admin/copyright.py --update-header
with the .gitattributes and copyright.py from Ie21365a.

Also adapt COPYING to match more or less the contents of the file in
release-4-6.

Part of #818.

Change-Id: I2885b36f65ac3599a7dfb66efdb7faed55fa9557