ALSA: usb-audio: Fix dB level of Bose Revolve+ SoundLink

Bose Revolve+ SoundLink (0a57:40fa) advertises invalid dB level for
the speaker volume.  This patch provides the correction in the mixer
map quirk table entry.

Note that this requires the prerequisite change to add min_mute flag
to the dB map table.

BugLink: https://bugzilla.suse.com/show_bug.cgi?id=1192375
Link: https://lore.kernel.org/r/20211116065415.11159-4-tiwai@suse.de


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