drm/vgem: Stop calling drm_drv_set_unique

With the previous patch this is now redudant, the core always
sets a reasonable dev->unique string.

Cc: Sean Paul <seanpaul@chromium.org>
Reviewed-by: NEmil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1466499262-18717-4-git-send-email-daniel.vetter@ffwll.ch

drivers/gpu/drm/vgem/vgem_drv.c

@@ -260,8 +260,6 @@ static int __init vgem_init(void)
 		goto out;
 	}
 
-	drm_dev_set_unique(vgem_device, "vgem");
-
 	ret  = drm_dev_register(vgem_device, 0);
 
 	if (ret)