[CFT] New headers from the maestro3 snd driver

Hello guys;

As some of you may have noticed I have been replacing
some GPL'd headers from the sound system.

In the case of the Maestro3 snd driver, basically
the same headers are available in the BSD licensed
OSS drivers (in the Attic though - that card is
rather old).

If someone still has that card please test this
patch:

http://people.freebsd.org/~pfg/patch-maestro3

Apparently there are also some open PRs related
to that card but it would certainly be good to
have some feedback on the status of this driver.

Pedro.