power: rk808: fix ldo register offset

Till now get_ldo_reg did a return &rk808_ldo[num - 1]; to return
the ldo register offset but didn't take into account that its
calling functions already created the ldo as ldo = dev->driver_data - 1.

This resulted in the setting for ldo8 writing to the register of ldo7
and so on. So fix this and get the correct ldo register data.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/power/regulator/rk8xx.c b/drivers/power/regulator/rk8xx.c
index e655c2d..c1ece96 100644
--- a/drivers/power/regulator/rk8xx.c
+++ b/drivers/power/regulator/rk8xx.c
@@ -92,9 +92,9 @@
 	struct rk8xx_priv *priv = dev_get_priv(pmic);
 	switch (priv->variant) {
 	case RK818_ID:
-		return &rk818_ldo[num - 1];
+		return &rk818_ldo[num];
 	default:
-		return &rk808_ldo[num - 1];
+		return &rk808_ldo[num];
 	}
 }