CMake: unit-tests: Add mbed-headers-lorawan headers library

Previously, all lorawan headers made as a part of the
mbed-headers-connectivity library. To make it easier to separate all
the lorawan headers into the separate mbed-headers-lorawan library
and keep them, as part of lorawan stubs CMake. This makes the lorawan
stubs more self-contained and improves the composition of the library.

Author: rajkan01

UNITTESTS/stubs/CMakeLists.txt

@@ -67,12 +67,6 @@ target_include_directories(mbed-headers-connectivity
         ${mbed-os_SOURCE_DIR}/connectivity/libraries/nanostack-libservice/mbed-client-libservice
         ${mbed-os_SOURCE_DIR}/connectivity/netsocket/include
         ${mbed-os_SOURCE_DIR}/connectivity
-        ${mbed-os_SOURCE_DIR}/connectivity/lorawan/include/lorawan
-        ${mbed-os_SOURCE_DIR}/connectivity/lorawan/lorastack
-        ${mbed-os_SOURCE_DIR}/connectivity/lorawan/lorastack/mac
-        ${mbed-os_SOURCE_DIR}/connectivity/lorawan/lorastack/phy
-        ${mbed-os_SOURCE_DIR}/connectivity/lorawan
-        ${mbed-os_SOURCE_DIR}/connectivity/lorawan/system
         ${mbed-os_SOURCE_DIR}/connectivity/mbedtls
         ${mbed-os_SOURCE_DIR}/connectivity/mbedtls/include
         ${mbed-os_SOURCE_DIR}/connectivity/FEATURE_BLE/include

connectivity/lorawan/tests/UNITTESTS/doubles/CMakeLists.txt

@@ -1,6 +1,18 @@
 # Copyright (c) 2021 ARM Limited. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
+add_library(mbed-headers-lorawan INTERFACE)
+
+target_include_directories(mbed-headers-lorawan
+    INTERFACE
+        ${mbed-os_SOURCE_DIR}/connectivity/lorawan/include/lorawan
+        ${mbed-os_SOURCE_DIR}/connectivity/lorawan/lorastack
+        ${mbed-os_SOURCE_DIR}/connectivity/lorawan/lorastack/mac
+        ${mbed-os_SOURCE_DIR}/connectivity/lorawan/lorastack/phy
+        ${mbed-os_SOURCE_DIR}/connectivity/lorawan
+        ${mbed-os_SOURCE_DIR}/connectivity/lorawan/system
+)
+
 add_library(mbed-stubs-lorawan)
 
 target_compile_definitions(mbed-stubs-lorawan
@@ -23,6 +35,7 @@ target_sources(mbed-stubs-lorawan
 target_link_libraries(mbed-stubs-lorawan
     PRIVATE
         mbed-headers
+        mbed-headers-lorawan
         mbed-stubs-headers
         gtest
 )