Bluetooth: Add support for L2CAP SREJ exception

When L2CAP loses an I-frame we send a SREJ frame to the transmitter side
requesting the lost packet. This patch implement all Recv I-frame events
on SREJ_SENT state table except the ones that deal with SendRej (the REJ
exception at receiver side is yet not implemented).

Signed-off-by: Gustavo F. Padovan <gustavo@las.ic.unicamp.br>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h
index b8b9a84..718394e 100644
--- a/include/net/bluetooth/bluetooth.h
+++ b/include/net/bluetooth/bluetooth.h
@@ -140,6 +140,7 @@
 	__u8 incoming;
 	__u8 tx_seq;
 	__u8 retries;
+	__u8 sar;
 };
 #define bt_cb(skb) ((struct bt_skb_cb *)((skb)->cb))