Bluetooth: Add store_hint parameter to mgmt_new_key

Even for keys that shouldn't be stored some use cases require the
knowledge of a new key having been created so that the conclusion of a
successful pairing can be made. Therefore, always send the mgmt_new_key
event but add a store_hint parameter to it to indicate to user space
whether the key should be stored or not.

Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

include/net/bluetooth/mgmt.h

@@ -230,6 +230,7 @@ struct mgmt_ev_controller_error {
 
 #define MGMT_EV_NEW_KEY			0x000A
 struct mgmt_ev_new_key {
+	__u8 store_hint;
 	struct mgmt_key_info key;
 } __packed;