USB: Move vendor subclass definition from usb/audio.h to usb/ch9.h

USB_SUBCLASS_VENDOR_SPEC is common to several USB classes and as such belongs
to usb/ch9.h.
Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

include/linux/usb/audio.h

@@ -24,7 +24,6 @@
 #define USB_SUBCLASS_AUDIOCONTROL	0x01
 #define USB_SUBCLASS_AUDIOSTREAMING	0x02
 #define USB_SUBCLASS_MIDISTREAMING	0x03
-#define USB_SUBCLASS_VENDOR_SPEC	0xff
 
 /* A.5 Audio Class-Specific AC interface Descriptor Subtypes*/
 #define HEADER				0x01

include/linux/usb/ch9.h

@@ -258,6 +258,8 @@ struct usb_device_descriptor {
 #define USB_CLASS_APP_SPEC		0xfe
 #define USB_CLASS_VENDOR_SPEC		0xff
 
+#define USB_SUBCLASS_VENDOR_SPEC	0xff
+
 /*-------------------------------------------------------------------------*/
 
 /* USB_DT_CONFIG: Configuration descriptor information.