[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/p54pci.c b/drivers/net/wireless/p54pci.c
index 7592758..410b543 100644
--- a/drivers/net/wireless/p54pci.c
+++ b/drivers/net/wireless/p54pci.c
@@ -640,7 +640,7 @@
 	struct ieee80211_hw *dev = pci_get_drvdata(pdev);
 	struct p54p_priv *priv = dev->priv;
 
-	if (priv->common.mode != IEEE80211_IF_TYPE_MGMT) {
+	if (priv->common.mode != IEEE80211_IF_TYPE_INVALID) {
 		ieee80211_stop_queues(dev);
 		p54p_stop(dev);
 	}
@@ -658,7 +658,7 @@
 	pci_set_power_state(pdev, PCI_D0);
 	pci_restore_state(pdev);
 
-	if (priv->common.mode != IEEE80211_IF_TYPE_MGMT) {
+	if (priv->common.mode != IEEE80211_IF_TYPE_INVALID) {
 		p54p_open(dev);
 		ieee80211_start_queues(dev);
 	}