Automatically enable used HAL driver modules

Currently, to add a driver module to a project, you have to:
- Add the driver module in `CMakeLists.txt`
- Set the driver module enabled (e.g. in a HAL config file, such as
  `stm32f4xx_hal_conf.h`)

This change automatically sets the driver module enable definition when
a module is included in `CMakeLists.txt`, meaning that you don't also
have to edit a header file to enable the module.

Author: shoftmadder

cmake/FindHAL.cmake

@@ -215,6 +215,7 @@ foreach(COMP ${HAL_FIND_COMPONENTS_FAMILIES})
     if(NOT (TARGET HAL::STM32::${FAMILY}${CORE_C}))
         message(TRACE "FindHAL: creating library HAL::STM32::${FAMILY}${CORE_C}")
         add_library(HAL::STM32::${FAMILY}${CORE_C} INTERFACE IMPORTED)
+        target_compile_definitions(HAL::STM32::${FAMILY}${CORE_C} INTERFACE "USE_HAL_DRIVER")
         target_link_libraries(HAL::STM32::${FAMILY}${CORE_C} INTERFACE 
                                                     STM32::${FAMILY}${CORE_C} 
                                                     CMSIS::STM32::${FAMILY}${CORE_C})
@@ -246,6 +247,7 @@ foreach(COMP ${HAL_FIND_COMPONENTS_FAMILIES})
         if(HAL_${FAMILY}${CORE_U}_${DRV}_SOURCE AND (NOT (TARGET HAL::STM32::${FAMILY}::${DRV})))
             message(TRACE "FindHAL: creating library HAL::STM32::${FAMILY}${CORE_C}::${DRV}")
             add_library(HAL::STM32::${FAMILY}${CORE_C}::${DRV} INTERFACE IMPORTED)
+            target_compile_definitions(HAL::STM32::${FAMILY}${CORE_C}::${DRV} INTERFACE "HAL_${DRV}_MODULE_ENABLED")
             target_link_libraries(HAL::STM32::${FAMILY}${CORE_C}::${DRV} INTERFACE HAL::STM32::${FAMILY}${CORE_C})
             target_sources(HAL::STM32::${FAMILY}${CORE_C}::${DRV} INTERFACE "${HAL_${FAMILY}${CORE_U}_${DRV}_SOURCE}")
         endif()