Merge pull request #128 from alxhoff/fix-ll-skip-full-lldriver

Added ability to skip full LL driver use using `NO_STM32LL_FULL_DRIVER`

cmake/FindSTM32LL.cmake

@@ -83,7 +83,9 @@ ELSEIF(STM32_FAMILY STREQUAL "L4")
 
 ENDIF()
 
-ADD_DEFINITIONS(-DUSE_FULL_LL_DRIVER)
+IF(NOT NO_STM32LL_FULL_DRIVER)
+    ADD_DEFINITIONS(-DUSE_FULL_LL_DRIVER)
+ENDIF()
 
 FOREACH(cmp ${LL_REQUIRED_COMPONENTS})
 	LIST(FIND STM32LL_FIND_COMPONENTS ${cmp} STM32LL_FOUND_INDEX)