Bluetooth: Add a convenience function to check for SSP enabled

It's a very common test to see if both the local and the remote device
have SSP enabled. By creating a simple function to test this we can
shorten many if-statements in the code.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 94ba869..25f449f 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -411,6 +411,13 @@
 	HCI_CONN_REMOTE_OOB,
 };
 
+static inline bool hci_conn_ssp_enabled(struct hci_conn *conn)
+{
+	struct hci_dev *hdev = conn->hdev;
+	return (test_bit(HCI_SSP_ENABLED, &hdev->flags) &&
+				test_bit(HCI_CONN_SSP_ENABLED, &conn->flags));
+}
+
 static inline void hci_conn_hash_init(struct hci_dev *hdev)
 {
 	struct hci_conn_hash *h = &hdev->conn_hash;