sctp: add SCTP_ADDR_REMOVED event

sctp_ulpevent_nofity_peer_addr_change() is called in
sctp_assoc_rm_peer() to send SCTP_ADDR_REMOVED event
when this transport is removed from the asoc.

This event is described in rfc6458#section-6.1.2:

  SCTP_ADDR_REMOVED:  The address is no longer part of the
     association.
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

net/sctp/associola.c

@@ -569,6 +569,7 @@ void sctp_assoc_rm_peer(struct sctp_association *asoc,
 
 	asoc->peer.transport_count--;
 
+	sctp_ulpevent_nofity_peer_addr_change(peer, SCTP_ADDR_REMOVED, 0);
 	sctp_transport_free(peer);
 }