ARM: imx6: do not call imx6q_suspend_init() with !CONFIG_SUSPEND

When CONFIG_SUSPEND is not enabled, we should reasonably skip the call
to imx6q_suspend_init().
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/mach-imx/pm-imx6q.c

@@ -516,10 +516,12 @@ static void __init imx6_pm_common_init(const struct imx6_pm_socdata
 
 	WARN_ON(!ccm_base);
 
+	if (IS_ENABLED(CONFIG_SUSPEND)) {
 		ret = imx6q_suspend_init(socdata);
 		if (ret)
 			pr_warn("%s: No DDR LPM support with suspend %d!\n",
 				__func__, ret);
+	}
 
 	/*
 	 * This is for SW workaround step #1 of ERR007265, see comments