FROMGIT: ALSA: usb-audio: Export USB SND APIs for modules

Some vendor modules will utilize useful parsing and endpoint management
APIs to start audio playback/capture.

Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Tested-by: Puma Hsu <pumahsu@google.com>
Tested-by: Daehwan Jung <dh10.jung@samsung.com>
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250409194804.3773260-9-quic_wcheng@quicinc.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 392112015
(cherry picked from commit 5a49a6ba
https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git

 usb-next)
Change-Id: I05ab1229cf340934e7251f84736e48254e9408ee
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>