compal-laptop: depends on POWER_SUPPLY

compal-laptop uses power_supply interfaces so it should depend
on POWER_SUPPLY.

ERROR: "power_supply_register" [drivers/platform/x86/compal-laptop.ko] undefined!
ERROR: "power_supply_unregister" [drivers/platform/x86/compal-laptop.ko] undefined!
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc:	Cezary Jackiewicz <cezary.jackiewicz@gmail.com>
Cc:	Matthew Garrett <mjg@redhat.com>
Cc:	platform-driver-x86@vger.kernel.org
Signed-off-by: Matthew Garrett <mjg@redhat.com>

drivers/platform/x86/Kconfig

@@ -183,6 +183,7 @@ config COMPAL_LAPTOP
 	depends on BACKLIGHT_CLASS_DEVICE
 	depends on RFKILL
 	depends on HWMON
+	depends on POWER_SUPPLY
 	---help---
 	  This is a driver for laptops built by Compal: