regulator: tps6586x: add dependancy on MFD_TPS6585x

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

drivers/regulator/Kconfig

@@ -231,7 +231,7 @@ config REGULATOR_AB8500
 
 config REGULATOR_TPS6586X
 	tristate "TI TPS6586X Power regulators"
-	depends on I2C
+	depends on MFD_TPS6586X
 	help
 	  This driver supports TPS6586X voltage regulator chips.