tests: Convert the ctx test to use render nodes when possible

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>

tests/gem_ctx_exec.c

@@ -102,7 +102,7 @@ int main(int argc, char *argv[])
 
 	igt_skip_on_simulation();
 
-	fd = drm_open_any();
+	fd = drm_open_any_render();
 
 	ctx_id = gem_context_create(fd);
 	handle = gem_create(fd, 4096);