um: switch to use of drivers/Kconfig

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
diff --git a/drivers/isdn/Kconfig b/drivers/isdn/Kconfig
index 4fb6016..a233ed5 100644
--- a/drivers/isdn/Kconfig
+++ b/drivers/isdn/Kconfig
@@ -5,7 +5,7 @@
 menuconfig ISDN
 	bool "ISDN support"
 	depends on NET
-	depends on !S390
+	depends on !S390 && !UML
 	---help---
 	  ISDN ("Integrated Services Digital Network", called RNIS in France)
 	  is a fully digital telephone service that can be used for voice and