drm: add missing include to drm_vram_mm_helper.h

The macro DRM_VRAM_MM_FILE_OPERATIONS referencs
functions declared in other header files.
Include these header files so this header files
pulls in what it references.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Emil Velikov <emil.velikov@collabora.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Sean Paul <sean@poorly.run>
Cc: David Airlie <airlied@linux.ie>
Link: https://patchwork.freedesktop.org/patch/msgid/20190630061922.7254-31-sam@ravnborg.org

include/drm/drm_vram_mm_helper.h

@@ -3,6 +3,8 @@
 #ifndef DRM_VRAM_MM_HELPER_H
 #define DRM_VRAM_MM_HELPER_H
 
+#include <drm/drm_file.h>
+#include <drm/drm_ioctl.h>
 #include <drm/ttm/ttm_bo_driver.h>
 
 struct drm_device;