ALSA: usb-audio: Add quirk_flags module option

This patch adds a new module option, quirk_flags, for allowing user to
try some additional device-specific quirk behavior more easily.
When this option is set to non-zero, it overrides the quirk_flags, and
the specific workaround is applied.

Link: https://lore.kernel.org/r/20210729074404.19728-5-tiwai@suse.de


Signed-off-by: Takashi Iwai <tiwai@suse.de>