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/rtc/Kconfig b/drivers/rtc/Kconfig
index 5a538fc..53eb4e5 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -8,7 +8,7 @@
 menuconfig RTC_CLASS
 	bool "Real Time Clock"
 	default n
-	depends on !S390
+	depends on !S390 && !UML
 	select RTC_LIB
 	help
 	  Generic RTC class support. If you say yes here, you will