ALSA: usb-audio: Exclude Scarlett 2i2 1st Gen from SKIP_IFACE_SETUP

The Focusrite Scarlett 2i2 1st Gen (1235:8006) produces
distorted/silent audio when QUIRK_FLAG_SKIP_IFACE_SETUP is active, as
that flag causes the feedback format to be detected as 17.15 instead
of 16.16.

Add a DEVICE_FLG entry for this device before the Focusrite VENDOR_FLG
entry so that it gets no quirk flags, overriding the vendor-wide
SKIP_IFACE_SETUP. This device doesn't have the internal mixer, Air, or
Safe modes that the quirk was designed to protect.

Fixes: 38c3220 ("ALSA: usb-audio: Add QUIRK_FLAG_SKIP_IFACE_SETUP")
Reported-by: pairomaniac [geoffreybennett/linux-fcp#54]
Tested-by: pairomaniac [geoffreybennett/linux-fcp#54]
Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
Link: https://patch.msgid.link/abmsTjKmQMKbhYtK@m.b4.vu
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Author: geoffreybennett

sound/usb/quirks.c

@@ -2429,6 +2429,7 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
 		   QUIRK_FLAG_CTL_MSG_DELAY | QUIRK_FLAG_IFACE_DELAY),
 	VENDOR_FLG(0x07fd, /* MOTU */
 		   QUIRK_FLAG_VALIDATE_RATES),
+	DEVICE_FLG(0x1235, 0x8006, 0), /* Focusrite Scarlett 2i2 1st Gen */
 	VENDOR_FLG(0x1235, /* Focusrite Novation */
 		   QUIRK_FLAG_SKIP_CLOCK_SELECTOR |
 		   QUIRK_FLAG_SKIP_IFACE_SETUP),