ALSA: snd-usb: Playback Design: use usb_set_inferface quirk from more locations

It turns out the devices from Playback Design need the delay quirk
after usb_set_interface from clocks.c as well. Make it a proper
quirks function and factor out the code to quirks.c.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 754cb5b..815a37d 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -349,12 +349,7 @@
 		subs->interface = fmt->iface;
 		subs->altset_idx = fmt->altset_idx;
 
-		/*
-		 * "Playback Design" products need a 50ms delay after setting the
-		 * USB interface.
-		 */
-		if (le16_to_cpu(dev->descriptor.idVendor) == 0x23ba)
-			mdelay(50);
+		snd_usb_set_interface_quirk(dev);
 	}
 
 	subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,