drm/qxl: fix include notation and remove -Iinclude/drm flag

Include <drm/*.h> instead of relative path from include/drm, then
remove the -Iinclude/drm compiler flag.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1493009447-31524-13-git-send-email-yamada.masahiro@socionext.com

drivers/gpu/drm/qxl/qxl_display.c

@@ -23,16 +23,15 @@
  *          Alon Levy
  */
 
-
 #include <linux/crc32.h>
-
-#include "qxl_drv.h"
-#include "qxl_object.h"
-#include "drm_crtc_helper.h"
+#include <drm/drm_crtc_helper.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_atomic.h>
 
+#include "qxl_drv.h"
+#include "qxl_object.h"
+
 static bool qxl_head_enabled(struct qxl_head *head)
 {
 	return head->width && head->height;