drm: drm_mode.h fix includes

Instead of using linux/types.h, drm headers should use drm.h, in order
to handle the portability issues in only one place.
Signed-off-by: Gabriel Laskar <gabriel@lse.epita.fr>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
CC: Emil Velikov <emil.l.velikov@gmail.com>
CC: Mikko Rapeli <mikko.rapeli@iki.fi>

include/uapi/drm/drm_mode.h

@@ -27,7 +27,7 @@
 #ifndef _DRM_MODE_H
 #define _DRM_MODE_H
 
-#include <linux/types.h>
+#include "drm.h"
 
 #define DRM_DISPLAY_INFO_LEN	32
 #define DRM_CONNECTOR_NAME_LEN	32