Revert "openthread: kconfig: rework OpenThread security configurations"

This reverts commit 88f3a98.

Signed-off-by: Ioannis Glaropoulos <[email protected]>

Author: ioannisg

subsys/net/l2/openthread/Kconfig

@@ -2,12 +2,6 @@
 
 # Copyright (c) 2018 Nordic Semiconductor ASA
 # SPDX-License-Identifier: Apache-2.0
-config OPENTHREAD_SECURITY_INTERNAL
-	bool
-	help
-	  OpenThread setting to signal that OpenThread security settings, such
-	  as the OPENTHREAD_MBEDTLS setting will be controlled through other
-	  Kconfig dependencies and should not be user configurable.
 
 menuconfig NET_L2_OPENTHREAD
 	bool "OpenThread L2"
@@ -159,32 +153,9 @@ config OPENTHREAD_SHELL
 	depends on SHELL
 	default y
 
-config MBEDTLS_PROMPTLESS
-	bool
-	default y if !CUSTOM_OPENTHREAD_SECURITY
-
-choice OPENTHREAD_SECURITY
-	prompt "OpenThread security"
-	default OPENTHREAD_MBEDTLS_CHOICE
-	depends on !OPENTHREAD_SECURITY_INTERNAL
-
-config CUSTOM_OPENTHREAD_SECURITY
-	bool "Custom"
-	help
-	  Security settings will be controlled directly by the user.
-	  Enabling this setting will give access to full control of mbed TLS
-	  configuration.
-
-config OPENTHREAD_MBEDTLS_CHOICE
-	bool "mbed TLS built-in"
-	select OPENTHREAD_MBEDTLS
-	help
-	  Use the OpenThread mbed TLS configuration pre-defined security scheme.
-
-endchoice
-
 config OPENTHREAD_MBEDTLS
-	bool
+	bool "Enable built-in mbedtls for use with OpenThread"
+	default y
 	select MBEDTLS
 	select MBEDTLS_ENABLE_HEAP
 	select MBEDTLS_CIPHER_AES_ENABLED