bridge: Use STP demux

Use the STP demux layer for receiving STP PDUs instead of directly
registering with LLC.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bridge/Kconfig b/net/bridge/Kconfig
index 12265af..e143ca6 100644
--- a/net/bridge/Kconfig
+++ b/net/bridge/Kconfig
@@ -5,6 +5,7 @@
 config BRIDGE
 	tristate "802.1d Ethernet Bridging"
 	select LLC
+	select STP
 	---help---
 	  If you say Y here, then your Linux box will be able to act as an
 	  Ethernet bridge, which means that the different Ethernet segments it