net/route: export symbol ip_tos2prio

Need to export this to enable drivers use rt_tos2priority()

Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index e5647b4..634aa82 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -230,7 +230,7 @@
 	TC_PRIO_INTERACTIVE_BULK,
 	ECN_OR_COST(INTERACTIVE_BULK)
 };
-
+EXPORT_SYMBOL(ip_tos2prio);
 
 /*
  * Route cache.