modules: add OpenThread platform implementation

Copy OpenThread platform implementation from upstream Zephyr,
based on commit 10eb60b48111d529ab30bae2a344226accb3ded6
to enable development of Nordic-specific platform implementation.

Signed-off-by: Maciej Baczmanski <[email protected]>

Author: maciejbaczmanski

modules/openthread/CMakeLists.txt

@@ -0,0 +1,19 @@
+# Copyright (c) 2022 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+config OPENTHREAD
+	bool "OpenThread Support"
+	help
+	  This option enables the OpenThread library
+
+if OPENTHREAD
+
+menu "OpenThread stack features"
+rsource "Kconfig.features"
+endmenu
+
+menu "Thread Network configuration"
+rsource "Kconfig.thread"
+endmenu
+
+endif # OPENTHREAD