regulator: core: Fix voltage change propagations to supply regulators

Some regulators support get_voltage() and some support get_voltage_sel()
operations but currently we only propagate changes if the regulator has
a get_voltage() operation.  Also do this if we've got get_voltage_sel()

[Rewite commit message for clarity -- broonie]

Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/core.c

@@ -2938,7 +2938,8 @@ static int regulator_set_voltage_unlocked(struct regulator *regulator,
 	if (rdev->supply &&
 	    regulator_ops_is_valid(rdev->supply->rdev,
 				   REGULATOR_CHANGE_VOLTAGE) &&
-	    (rdev->desc->min_dropout_uV || !rdev->desc->ops->get_voltage)) {
+	    (rdev->desc->min_dropout_uV || !(rdev->desc->ops->get_voltage ||
+					   rdev->desc->ops->get_voltage_sel))) {
 		int current_supply_uV;
 		int selector;