net: dsa: tag_8021q: include missing refcount.h

The previous assumption was that the caller would already have this
header file included.

Signed-off-by: Vladimir Oltean <[email protected]>
Reviewed-by: Florian Fainelli <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: vladimiroltean

include/linux/dsa/8021q.h

@@ -5,6 +5,7 @@
 #ifndef _NET_DSA_8021Q_H
 #define _NET_DSA_8021Q_H
 
+#include <linux/refcount.h>
 #include <linux/types.h>
 
 struct dsa_switch;