Bluetooth: Add skeleton for SMP self-tests

This patch adds the initial skeleton and kernel config option for SMP
self-tests.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/bluetooth/Kconfig b/net/bluetooth/Kconfig
index 8d3b607..7de7463 100644
--- a/net/bluetooth/Kconfig
+++ b/net/bluetooth/Kconfig
@@ -84,4 +84,11 @@
 	  Run test cases for ECDH cryptographic functionality used by the
 	  Bluetooth Low Energy Secure Connections feature.
 
+config BT_SELFTEST_SMP
+	bool "SMP test cases"
+	depends on BT_LE && BT_SELFTEST
+	help
+	  Run test cases for SMP cryptographic functionality, including both
+	  legacy SMP as well as the Secure Connections features.
+
 source "drivers/bluetooth/Kconfig"