freedreno/computerator: Use a render node

Fixes headless systems.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6562>

src/freedreno/computerator/main.c

@@ -238,7 +238,7 @@ main(int argc, char **argv)
 		}
 	}
 
-	int fd = drmOpen("msm", NULL);
+	int fd = drmOpenWithType("msm", NULL, DRM_NODE_RENDER);
 	if (fd < 0)
 		err(1, "could not open drm device");