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2022-05-16T15:06:53.442093Z
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Add deprecation notices to ISA sound cards

ISA sound cards (and ISA itself) are long obsolete.  NYCBUG dmesgd has
no entries for any of these devices after 2005.

Mail to -current and -stable revealed some nostalgic interest, but
no offers to test or requests to pospone the deprecation.

Add deprecation notices to device attach routines and man pages for:

snd_ad1816  Analog Devices AD1816 SoundPort
snd_ess     Ensoniq ESS
snd_gusc    Gravis UltraSound (MAX and newer AFAIK)
snd_mss     Microsoft Sound System
snd_sbc     Creative Sound Blaster

Reviewed by:	cy, mav
MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D34604

(cherry picked from commit e39ec8933be4d6e74cfb32680fb3e67469e66bb7)
(cherry picked from commit d7620b6ec941fc6239bb2600495c2978181cfe28)

Git Hash:   af89ff11fcfebe7e2de004766e86e8061ab57681
Git Author: emaste@FreeBSD.org
END