CMake: unit-tests: Move mbed-headers-hal to the hal directory

Move the header-only mbed-headers-hal library the unit test stubs
depend on into the hal component directory. This makes the events
stubs more self-contained and improves the composition of the library.

Author: rajkan01

UNITTESTS/stubs/CMakeLists.txt

@@ -7,7 +7,6 @@ add_library(mbed-headers-base INTERFACE)
 add_library(mbed-headers-platform INTERFACE)
 add_library(mbed-headers-connectivity INTERFACE)
 add_library(mbed-headers-storage INTERFACE)
-add_library(mbed-headers-hal INTERFACE)
 add_library(mbed-headers-events INTERFACE)
 
 target_link_libraries(mbed-headers
@@ -89,12 +88,6 @@ target_include_directories(mbed-headers-events
         ${mbed-os_SOURCE_DIR}/events/include/events/internal
 )
 
-target_include_directories(mbed-headers-hal
-    INTERFACE
-        ${mbed-os_SOURCE_DIR}/hal
-        ${mbed-os_SOURCE_DIR}/hal/include
-)
-
 target_include_directories(mbed-headers
     INTERFACE
         ${mbed-os_SOURCE_DIR}/features

hal/tests/UNITTESTS/doubles/CMakeLists.txt

@@ -1,6 +1,14 @@
 # Copyright (c) 2021 ARM Limited. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
+add_library(mbed-headers-hal INTERFACE)
+
+target_include_directories(mbed-headers-hal
+    INTERFACE
+        ${mbed-os_SOURCE_DIR}/hal
+        ${mbed-os_SOURCE_DIR}/hal/include
+)
+
 add_library(mbed-stubs-hal)
 
 target_compile_definitions(mbed-stubs-hal