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/quirks.h b/sound/usb/quirks.h
index 0ca9e91..7c3681f 100644
--- a/sound/usb/quirks.h
+++ b/sound/usb/quirks.h
@@ -26,6 +26,7 @@
 
 void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep);
 
+void snd_usb_set_interface_quirk(struct usb_device *dev);
 void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe,
 			   __u8 request, __u8 requesttype, __u16 value,
 			   __u16 index, void *data, __u16 size);