drm/sti: Remove duplicated include from sti_drv.c

Remove duplicated include.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190620150306.124839-1-yuehaibing@huawei.com

drivers/gpu/drm/sti/sti_drv.c

@@ -23,7 +23,6 @@
 
 #include "sti_crtc.h"
 #include "sti_drv.h"
-#include "sti_drv.h"
 #include "sti_plane.h"
 
 #define DRIVER_NAME	"sti"