drm/mediatek: direct include of drm.h in mtk_drm_gem.c

Do not rely on including drm.h from drm_file.h,
as the include in drm_file.h will be dropped.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Sean Paul <sean@poorly.run>
Acked-by: CK Hu <ck.hu@mediatek.com>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-mediatek@lists.infradead.org
Link: https://patchwork.freedesktop.org/patch/msgid/20190718161507.2047-11-sam@ravnborg.org

drivers/gpu/drm/mediatek/mtk_drm_gem.c

@@ -5,6 +5,7 @@
 
 #include <linux/dma-buf.h>
 
+#include <drm/drm.h>
 #include <drm/drm_device.h>
 #include <drm/drm_gem.h>
 #include <drm/drm_prime.h>