headers: include linux/types.h where appropriate

This addresses some header check warnings.  DRM headers which include
"drm.h" have been excluded, as they indirectly include types.h.

Signed-off-by: Bobby Powers <bobbypowers@gmail.com>
Cc: Chris Ball <cjb@laptop.org>
Cc: Dave Airlie <airlied@linux.ie>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/drm/drm_mode.h b/include/drm/drm_mode.h
index 2a2acda..4a0aae3 100644
--- a/include/drm/drm_mode.h
+++ b/include/drm/drm_mode.h
@@ -27,6 +27,8 @@
 #ifndef _DRM_MODE_H
 #define _DRM_MODE_H
 
+#include <linux/types.h>
+
 #define DRM_DISPLAY_INFO_LEN	32
 #define DRM_CONNECTOR_NAME_LEN	32
 #define DRM_DISPLAY_MODE_LEN	32