test: Move delay skipping to test_pre_run()

This allows delays to be skipped in sandbox tests. Move it to the
common pre-init function.

Signed-off-by: Simon Glass <sjg@chromium.org>

test/ut.c

@@ -133,3 +133,10 @@ void ut_unsilence_console(struct unit_test_state *uts)
 {
 	gd->flags &= ~(GD_FLG_SILENT | GD_FLG_RECORD);
 }
+
+void ut_set_skip_delays(struct unit_test_state *uts, bool skip_delays)
+{
+#ifdef CONFIG_SANDBOX
+	state_set_skip_delays(skip_delays);
+#endif
+}