ALSA: usb-audio: Make mic volume workarounds globally applicable

It seems that many webcams have buggy firmware and don't expose the
mic capture volume with the proper resolution.  We have workarounds in
mixer.c, but judging from the numbers, those can be better managed as
global quirk flags.

Link: https://patch.msgid.link/20241105120220.5740-2-tiwai@suse.de


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