usb: typec: Ensure USB_ROLE_SWITCH is set as a dependency for tps6598x

When I switched on USB role switching for the tps6598x I completely forgot
to add the Kconfig dependency.

Ensure USB_ROLE_SWITCH is selected to prevent the typs6598x driver being
compiled in but the role-switch driver being compiled as a module, leading
to link error.

Suggested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20200520153617.610909-1-bryan.odonoghue@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/Kconfig

@@ -64,7 +64,8 @@ config TYPEC_HD3SS3220
 config TYPEC_TPS6598X
 	tristate "TI TPS6598x USB Power Delivery controller driver"
 	depends on I2C
-	select REGMAP_I2C
+	depends on REGMAP_I2C
+	depends on USB_ROLE_SWITCH || !USB_ROLE_SWITCH
 	help
 	  Say Y or M here if your system has TI TPS65982 or TPS65983 USB Power
 	  Delivery controller.