net: remove NETIF_F_NO_CSUM feature bit

Only distinct use is checking if NETIF_F_NOCACHE_COPY should be
enabled by default. The check heuristics is altered a bit here,
so it hits other people than before. The default shouldn't be
trusted for performance-critical cases anyway.

For all other uses NETIF_F_NO_CSUM is equivalent to NETIF_F_HW_CSUM.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/ieee802154/fakehard.c

@@ -343,7 +343,7 @@ static void ieee802154_fake_setup(struct net_device *dev)
 {
 	dev->addr_len		= IEEE802154_ADDR_LEN;
 	memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
-	dev->features		= NETIF_F_NO_CSUM;
+	dev->features		= NETIF_F_HW_CSUM;
 	dev->needed_tailroom	= 2; /* FCS */
 	dev->mtu		= 127;
 	dev->tx_queue_len	= 10;