Bluetooth: Add support for Unconfigured Index Removed events

When a controller in an unconfigured state gets removed, then send
Unconfigured Index Removed events.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h
index 7da29fd..6519932 100644
--- a/include/net/bluetooth/mgmt.h
+++ b/include/net/bluetooth/mgmt.h
@@ -642,3 +642,5 @@
 } __packed;
 
 #define MGMT_EV_UNCONF_INDEX_ADDED	0x001d
+
+#define MGMT_EV_UNCONF_INDEX_REMOVED	0x001e