power: fan53555: fix fan53555_regulator_set_value

fan53555_regulator_set_value() passes its own dev to pmic_clrsetbits()
instead of its parent (pmic). As result u-boot crashes when you try to
set voltage on fan53555 regulator

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/drivers/power/regulator/fan53555.c b/drivers/power/regulator/fan53555.c
index 9c48b26..24a9b67 100644
--- a/drivers/power/regulator/fan53555.c
+++ b/drivers/power/regulator/fan53555.c
@@ -159,7 +159,7 @@
 	debug("%s: uV=%d; writing volume %d: %02x\n",
 	      __func__, uV, pdata->vol_reg, vol);
 
-	return pmic_clrsetbits(dev, pdata->vol_reg, GENMASK(6, 0), vol);
+	return pmic_clrsetbits(dev->parent, pdata->vol_reg, GENMASK(6, 0), vol);
 }
 
 static int fan53555_voltages_setup(struct udevice *dev)