Bluetooth: Fix removing any IRKs when unpairing devices

When mgmt_unpair_device is called we should also remove any associated
IRKs. This patch adds a hci_remove_irk convenience function and ensures
that it's called when mgmt_unpair_device is called.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index fbb76a0..90aac90 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -2328,6 +2328,8 @@
 		else
 			addr_type = ADDR_LE_DEV_RANDOM;
 
+		hci_remove_irk(hdev, &cp->addr.bdaddr, addr_type);
+
 		err = hci_remove_ltk(hdev, &cp->addr.bdaddr, addr_type);
 	}