regulator: Make bulk API support optional supplies

Make it possible to use the bulk API with optional supplies, by allowing
the consumer to marking supplies as optional in the regulator_bulk_data.

Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/regulator/devres.c b/drivers/regulator/devres.c
index 6ec1d40..6ad8ab4 100644
--- a/drivers/regulator/devres.c
+++ b/drivers/regulator/devres.c
@@ -164,8 +164,11 @@
 		consumers[i].consumer = NULL;
 
 	for (i = 0; i < num_consumers; i++) {
-		consumers[i].consumer = devm_regulator_get(dev,
-							   consumers[i].supply);
+		consumers[i].consumer = _devm_regulator_get(dev,
+							    consumers[i].supply,
+							    consumers[i].optional ?
+								OPTIONAL_GET :
+								NORMAL_GET);
 		if (IS_ERR(consumers[i].consumer)) {
 			ret = PTR_ERR(consumers[i].consumer);
 			dev_err(dev, "Failed to get supply '%s': %d\n",