FROMLIST(v1): pmdomain: rockchip: quiet regulator error on -EPROBE_DEFER

Change the dev_err() to dev_err_probe() under rockchip_pd_power_on()
to prevent errors early in the boot process when the requested
regulator is not yet available. This converts errors like the following
to debug messages:

rockchip-pm-domain fd8d8000.power-management:power-controller: Failed to enable supply: -517

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>

Author: macromorgan

drivers/pmdomain/rockchip/pm-domains.c

@@ -688,7 +688,8 @@ static int rockchip_pd_power_on(struct generic_pm_domain *domain)
 
 	ret = rockchip_pd_regulator_enable(pd);
 	if (ret) {
-		dev_err(pd->pmu->dev, "Failed to enable supply: %d\n", ret);
+		dev_err_probe(pd->pmu->dev, ret,
+			      "Failed to enable supply: %d\n", ret);
 		return ret;
 	}