[MAC80211]: add "invalid" interface type

Since I cannot convince the lazy driver authors (hello Michael)
to stop (ab)using the MGMT interface type internally in their
drivers, this patch introduces a new _INVALID type especially
for their use and changes all affected drivers to use it.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/wireless/p54common.c b/drivers/net/wireless/p54common.c
index 9befd6c..2c63cf0 100644
--- a/drivers/net/wireless/p54common.c
+++ b/drivers/net/wireless/p54common.c
@@ -797,7 +797,7 @@
 		kfree_skb(skb);
 	}
 	priv->stop(dev);
-	priv->mode = IEEE80211_IF_TYPE_MGMT;
+	priv->mode = IEEE80211_IF_TYPE_INVALID;
 }
 
 static int p54_add_interface(struct ieee80211_hw *dev,
@@ -949,7 +949,7 @@
 		return NULL;
 
 	priv = dev->priv;
-	priv->mode = IEEE80211_IF_TYPE_MGMT;
+	priv->mode = IEEE80211_IF_TYPE_INVALID;
 	skb_queue_head_init(&priv->tx_queue);
 	memcpy(priv->channels, p54_channels, sizeof(p54_channels));
 	memcpy(priv->rates, p54_rates, sizeof(p54_rates));