regulator: Fix pickable ranges mapping

Pickable ranges mapping function never used range min selector. Thus
existing drivers broke when proper linear_ranges functionality was taken
in use. Fix this for now just by ignoring the minimum selector.

Fixes: 60ab7f41 ("regulator: use linear_ranges helper")
Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Link: https://lore.kernel.org/r/20200612090225.GA3243@localhost.localdomainSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/helpers.c

@@ -486,7 +486,7 @@ int regulator_map_voltage_pickable_linear_range(struct regulator_dev *rdev,
 			continue;
 		}
 
-		ret = selector + sel;
+		ret = selector + sel - range->min_sel;
 
 		voltage = rdev->desc->ops->list_voltage(rdev, ret);