regulator: arizona: Add support for microphone supplies on Arizona devices

The Wolfson Arizona platform is used for a range of low power audio hub
CODECs. Many of these devices feature an integrated power supply for the
microphone which is supported by this driver.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 434462a..e056c09 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -89,6 +89,13 @@
 	  If you have a AnalogicTech AAT2870 say Y to enable the
 	  regulator driver.
 
+config REGULATOR_ARIZONA
+	tristate "Wolfson Arizona class devices"
+	depends on MFD_ARIZONA
+	help
+	  Support for the regulators found on Wolfson Arizona class
+	  devices.
+
 config REGULATOR_DA903X
 	tristate "Dialog Semiconductor DA9030/DA9034 regulators"
 	depends on PMIC_DA903X