tcp: record TLP and ER timer stats in v6 stats

commit ce3cf4ec0305919fc69a972f6c2b2efd35d36abc upstream.

The v6 tcp stats scan do not provide TLP and ER timer information
correctly like the v4 version . This patch fixes that.

Fixes: 6ba8a3b1 ("tcp: Tail loss probe (TLP)")
Fixes: eed530b6 ("tcp: early retransmit")
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>