drm_hwcomposer: Raise clang-tidy level of some files to NORMAL

Signed-off-by: Roman Stratiienko <roman.o.stratiienko@globallogic.com>
diff --git a/backend/BackendManager.cpp b/backend/BackendManager.cpp
index 36fb55f..0577e2f 100644
--- a/backend/BackendManager.cpp
+++ b/backend/BackendManager.cpp
@@ -36,7 +36,7 @@
 }
 
 int BackendManager::RegisterBackend(const std::string &name,
-                                    backend_constructor_t backend_constructor) {
+                                    BackendConstructorT backend_constructor) {
   available_backends_[name] = std::move(backend_constructor);
   return 0;
 }