net: export netdev_txq_to_tc to allow sch_mqprio to compile as module

In commit 3230290 ("mqprio: Reserve last 32 classid values for HW
traffic classes and misc IDs") sch_mqprio started using netdev_txq_to_tc
to find the correct tc instead of dev->tc_to_txq[]

However, when mqprio is compiled as a module, it cannot resolve the
symbol, leading to this error:

     ERROR: "netdev_txq_to_tc" [net/sched/sch_mqprio.ko] undefined!

This adds an EXPORT_SYMBOL() since the other user in the kernel
(netif_set_xps_queue) is also EXPORT_SYMBOL() (and not _GPL) or in a
sysfs-callback.

Cc: Alexander Duyck <[email protected]>
Cc: Jesus Sanchez-Palencia <[email protected]>
Cc: David S. Miller <[email protected]>
Signed-off-by: Henrik Austad <[email protected]>
Reviewed-by: Eric Dumazet <[email protected]>
Acked-by: Alexander Duyck <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: henrikau

net/core/dev.c

@@ -2040,6 +2040,7 @@ int netdev_txq_to_tc(struct net_device *dev, unsigned int txq)
 
 	return 0;
 }
+EXPORT_SYMBOL(netdev_txq_to_tc);
 
 #ifdef CONFIG_XPS
 static DEFINE_MUTEX(xps_map_mutex);