CMake: Add support for PSA its_ps test

The greentea test for mbed-psa its_ps can now be built with CMake.

Author: hazzlim

platform/FEATURE_EXPERIMENTAL_API/FEATURE_PSA/TARGET_MBED_PSA_SRV/TESTS/its_ps/test/CMakeLists.txt

@@ -0,0 +1,13 @@
+# Copyright (c) 2021 ARM Limited. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.19.0 FATAL_ERROR)
+
+set(MBED_PATH ${CMAKE_CURRENT_SOURCE_DIR}/../../../../../../../ CACHE INTERNAL "")
+set(TEST_TARGET mbed-platform-psa-its-ps)
+
+include(${MBED_PATH}/tools/cmake/mbed_greentea.cmake)
+
+project(${TEST_TARGET})
+
+mbed_greentea_add_test(TEST_NAME ${TEST_TARGET})