regulator: fix sysfs name collision between dummy and fixed dummy regulator

When regulator_register_fixed() is being used to register fixed dummy
regulator, the following line will be seen in the boot log.  And the
sysfs entry for fixed dummy regulator is not shown.

  dummy: Failed to create debugfs directory

The patch renames the fixed dummy supply to "fixed-dummy" to avoid
the name collision with dummy regulator.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/drivers/regulator/fixed-helper.c b/drivers/regulator/fixed-helper.c
index 30d0a15..efb52dc 100644
--- a/drivers/regulator/fixed-helper.c
+++ b/drivers/regulator/fixed-helper.c
@@ -32,7 +32,7 @@
 	if (!data)
 		return NULL;
 
-	data->cfg.supply_name = "dummy";
+	data->cfg.supply_name = "fixed-dummy";
 	data->cfg.microvolts = 0;
 	data->cfg.gpio = -EINVAL;
 	data->cfg.enabled_at_boot = 1;