Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/gpu/drm/radeon/r520.c b/drivers/gpu/drm/radeon/r520.c
index 074cf75..fc78e64 100644
--- a/drivers/gpu/drm/radeon/r520.c
+++ b/drivers/gpu/drm/radeon/r520.c
@@ -25,7 +25,7 @@
  *          Alex Deucher
  *          Jerome Glisse
  */
-#include <drm/drmP.h>
+
 #include "radeon.h"
 #include "radeon_asic.h"
 #include "atom.h"
@@ -44,7 +44,7 @@
 		if (tmp & R520_MC_STATUS_IDLE) {
 			return 0;
 		}
-		DRM_UDELAY(1);
+		udelay(1);
 	}
 	return -1;
 }