UPSTREAM: usb: gadget: u_audio: Support multiple sampling rates

Implement support for multiple sampling rates in u_audio part of the
audio gadget. The currently configured rates are exposed through
read-only amixer controls 'Capture Rate' and 'Playback Rate'.

Signed-off-by: Julian Scheel <julian@jusst.de>
Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com>
Link: https://lore.kernel.org/r/20220121155308.48794-3-pavel.hofman@ivitera.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Bug: 235196743
(cherry picked from commit c565ad07)
Change-Id: I389574571cec7bf7cbff5375dab6542f7c5bf5f2
Signed-off-by: Luiz Matheus <luizmmat@motorola.com>