MFC: r230401, r230898

MFC:	r230401, r230898

Replace GPLd headers from the Maestro3 driver with BSD licensed
versions derived from /usr/ports/audio/oss.

The particular headers used were taken from the
attic/drv/oss_allegro directory and are mostly identical
to the previous files.

The Maestro3 driver is now free from the GPL.

NOTE: due to lack of testers this driver is being
considered for deprecation and removal, however the MFC
still makes sense instead of distribution a GPL'd
firmware without source code.

PR:		kern/153920
Approved by:	jhb (mentor)

git-svn-id: svn://svn.freebsd.org/base/stable/9@230985 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f