gigaset: move up Kconfig inclusion point

In preparation for porting to kernel CAPI subsystem, include the
Gigaset driver's Kconfig directly from ISDN's instead of I4L's.

Impact: Kconfig reorganisation, no functional change
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/isdn/Kconfig b/drivers/isdn/Kconfig
index 3d113c6..02bdca6 100644
--- a/drivers/isdn/Kconfig
+++ b/drivers/isdn/Kconfig
@@ -61,4 +61,6 @@
 
 endif # ISDN_CAPI
 
+source "drivers/isdn/gigaset/Kconfig"
+
 endif # ISDN