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MFC 31070b5bc77a:

Description

MFC 31070b5bc77a:
Set default alternate setting when USB audio devices are not in use,
to activate power save features.

Differential Revision: https://reviews.freebsd.org/D28032
Suggested by: Shichun_Ma@Dell.com
Sponsored by: Mellanox Technologies // NVIDIA Networking

(cherry picked from commit 31070b5bc77a499009a835650eb9d4bf2eceaa15)