Bluetooth: Set txwin values for streaming mode

The transmit window values must be configured for streaming mode, even
though streaming mode does not have a window.  This enables use of
extended headers when the transmit window socket option is set to 64
or larger.
Signed-off-by: NMat Martineau <mathewm@codeaurora.org>
Signed-off-by: NGustavo Padovan <gustavo.padovan@collabora.co.uk>

net/bluetooth/l2cap_core.c

@@ -2941,6 +2941,7 @@ static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
 		break;
 
 	case L2CAP_MODE_STREAMING:
+		l2cap_txwin_setup(chan);
 		rfc.mode            = L2CAP_MODE_STREAMING;
 		rfc.txwin_size      = 0;
 		rfc.max_transmit    = 0;