Use menuconfig objects: ISDN

Unclutter the ISDN menu a tiny bit by moving ISDN4Linux and the CAPI2.0
layers into their own menu.
Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
Cc: Tilman Schmidt <tilman@imap.cc>
Acked-by: Karsten Keil <kkeil@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/isdn/Kconfig

@@ -21,7 +21,7 @@ menuconfig ISDN
 
 if ISDN
 
-config ISDN_I4L
+menuconfig ISDN_I4L
 	tristate "Old ISDN4Linux (deprecated)"
 	---help---
 	  This driver allows you to use an ISDN adapter for networking
@@ -43,7 +43,7 @@ if ISDN_I4L
 source "drivers/isdn/i4l/Kconfig"
 endif
 
-config ISDN_CAPI
+menuconfig ISDN_CAPI
 	tristate "CAPI 2.0 subsystem"
 	help
 	  This provides the CAPI (Common ISDN Application Programming