drm/virtio: 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/1493009447-31524-17-git-send-email-yamada.masahiro@socionext.com
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c b/drivers/gpu/drm/virtio/virtgpu_drv.c
index 2d29b01..63d35c7 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.c
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.c
@@ -29,8 +29,8 @@
 #include <linux/module.h>
 #include <linux/console.h>
 #include <linux/pci.h>
-#include "drmP.h"
-#include "drm/drm.h"
+#include <drm/drmP.h>
+#include <drm/drm.h>
 
 #include "virtgpu_drv.h"
 static struct drm_driver driver;