r8169: Be drop monitor friendly

rtl_tx() is the TX reclamation process whereas rtl8169_tx_clear_range() does
the TX ring cleaning during shutdown, both of these functions should call
dev_consume_skb_any() to be drop monitor friendly.

Fixes: cac4b22f ("r8169: do not account fragments as packets")
Fixes: eb781397 ("r8169: Do not use dev_kfree_skb in xmit path")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>