Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/drm/drm_encoder.h b/include/drm/drm_encoder.h
index 4f597c0..70cfca0 100644
--- a/include/drm/drm_encoder.h
+++ b/include/drm/drm_encoder.h
@@ -28,6 +28,7 @@
 #include <drm/drm_crtc.h>
 #include <drm/drm_mode.h>
 #include <drm/drm_mode_object.h>
+#include <drm/drm_util.h>
 
 struct drm_encoder;