greybus: add class matching macro

Add matching macro for bundle class.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/greybus.h

@@ -50,6 +50,10 @@
 	.vendor		= (v),					\
 	.product	= (p),
 
+#define GREYBUS_DEVICE_CLASS(c)					\
+	.match_flags	= GREYBUS_ID_MATCH_CLASS,		\
+	.class		= (c),
+
 /* Maximum number of CPorts */
 #define CPORT_ID_MAX	4095		/* UniPro max id is 4095 */
 #define CPORT_ID_BAD	U16_MAX