p54: unify ieee80211 device registration

All three drivers (p54pci, p54usb and p54spi) are implementing the
same functionality three times. So, why not put it into the shared library?!

Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/p54/p54usb.c b/drivers/net/wireless/p54/p54usb.c
index 3b5e54e..da6640a 100644
--- a/drivers/net/wireless/p54/p54usb.c
+++ b/drivers/net/wireless/p54/p54usb.c
@@ -976,11 +976,9 @@
 	if (err)
 		goto err_free_dev;
 
-	err = ieee80211_register_hw(dev);
-	if (err) {
-		dev_err(&udev->dev, "(p54usb) Cannot register netdevice\n");
+	err = p54_register_common(dev, &udev->dev);
+	if (err)
 		goto err_free_dev;
-	}
 
 	return 0;