sound tests: Add SNDSTIOC_ADD_USER_DEVS test

Test whether the SNDSTIOC_ADD_USER_DEVS IOCTL (registers a userland
device to /dev/sndstat) works properly.

Sponsored by: The FreeBSD Foundation
MFC aft

sound tests: Add SNDSTIOC_ADD_USER_DEVS test

Test whether the SNDSTIOC_ADD_USER_DEVS IOCTL (registers a userland
device to /dev/sndstat) works properly.

Sponsored by: The FreeBSD Foundation
MFC after: 2 days
Reviewed by: dev_submerge.ch
Differential Revision: https://reviews.freebsd.org/D46228

(cherry picked from commit 2668e76d6e764c5c361156ffa3d39eb02ce8e5d9)

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sound tests: Add sndstat nvlist ATF test

Sponsored by: The FreeBSD Foundation
MFC after: 2 days
Reviewed by: dev_submerge.ch, markj
Differential Revision: https://reviews.freebsd.org/D45901

(cherry

sound tests: Add sndstat nvlist ATF test

Sponsored by: The FreeBSD Foundation
MFC after: 2 days
Reviewed by: dev_submerge.ch, markj
Differential Revision: https://reviews.freebsd.org/D45901

(cherry picked from commit 95eb4b873b6a8b527c5bd78d7191975dfca38998)

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