Revert "cdc_subset: deal with a device that needs reset for timeout"

This reverts commit 20fbe3ae99.

As reported by Stephen Rothwell, it causes compile failures in certain
configurations:

  drivers/net/usb/cdc_subset.c:360:15: error: 'dummy_prereset' undeclared here (not in a function)
    .pre_reset = dummy_prereset,
                 ^
  drivers/net/usb/cdc_subset.c:361:16: error: 'dummy_postreset' undeclared here (not in a function)
    .post_reset = dummy_postreset,
                  ^

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: David Miller <davem@davemloft.net>
Cc: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/net/usb/usbnet.c

@@ -1218,12 +1218,8 @@ void usbnet_tx_timeout (struct net_device *net)
 
 	unlink_urbs (dev, &dev->txq);
 	tasklet_schedule (&dev->bh);
-	/* this needs to be handled individually because the generic layer
-	 * doesn't know what is sufficient and could not restore private
-	 * information if a remedy of an unconditional reset were used.
-	 */
-	if (dev->driver_info->recover)
-		(dev->driver_info->recover)(dev);
+
+	// FIXME: device recovery -- reset?
 }
 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);