bt: Fix unit tests build with CMake
-if(CONFIG_BT_ENABLED)
+if(CONFIG_BT_ENABLED OR CMAKE_BUILD_EARLY_EXPANSION)
set(COMPONENT_SRCDIRS ".")
set(COMPONENT_ADD_INCLUDEDIRS ".")
-endif()
-
set(COMPONENT_REQUIRES unity nvs_flash bt)
register_component()
+endif()
