MLECO-2921: Minor changes for HAL projects

Ensuring individual HAL projects can be configured without the
need to be wrapped. Tests can now be added to build individual
components and check for any unintended dependencies creeping
in.

Change-Id: I057699c3c3cc0fc280615db30a25fbe4c28ae8ea
Signed-off-by: Kshitij Sisodia <kshitij.sisodia@arm.com>
diff --git a/source/hal/source/platform/mps3/CMakeLists.txt b/source/hal/source/platform/mps3/CMakeLists.txt
index 2f0174b..2c03dee 100644
--- a/source/hal/source/platform/mps3/CMakeLists.txt
+++ b/source/hal/source/platform/mps3/CMakeLists.txt
@@ -85,6 +85,14 @@
 ## Platform component: PMU
 add_subdirectory(${COMPONENTS_DIR}/platform_pmu ${CMAKE_BINARY_DIR}/platform_pmu)
 
+## Logging utilities:
+if (NOT TARGET log)
+    if (NOT DEFINED LOG_PROJECT_DIR)
+        message(FATAL_ERROR "LOG_PROJECT_DIR needs to be defined.")
+    endif()
+    add_subdirectory(${LOG_PROJECT_DIR} ${CMAKE_BINARY_DIR}/log)
+endif()
+
 # Add dependencies:
 target_link_libraries(${PLATFORM_DRIVERS_TARGET} PUBLIC
     log