Add mISDN driver

mISDN is a new modular ISDN driver, in the long term it should replace
the old I4L driver architecture for passiv ISDN cards.
Signed-off-by: Karsten Keil <kkeil@suse.de>

Documentation/isdn/README.mISDN

+mISDN is a new modular ISDN driver, in the long term it should replace
+the old I4L driver architecture for passiv ISDN cards.
+It was designed to allow a broad range of applications and interfaces
+but only have the basic function in kernel, the interface to the user
+space is based on sockets with a own address family AF_ISDN.
+

drivers/isdn/Kconfig

@@ -3,7 +3,7 @@
 #
 
 menuconfig ISDN
-	tristate "ISDN support"
+	bool "ISDN support"
 	depends on NET
 	depends on !S390
 	---help---
@@ -21,6 +21,8 @@ menuconfig ISDN
 
 if ISDN
 
+source "drivers/isdn/mISDN/Kconfig"
+
 menuconfig ISDN_I4L
 	tristate "Old ISDN4Linux (deprecated)"
 	---help---

drivers/isdn/Makefile

@@ -4,6 +4,7 @@
 
 obj-$(CONFIG_ISDN_I4L)			+= i4l/
 obj-$(CONFIG_ISDN_CAPI)			+= capi/
+obj-$(CONFIG_MISDN)			+= mISDN/
 obj-$(CONFIG_ISDN_CAPI)			+= hardware/
 obj-$(CONFIG_ISDN_DIVERSION)		+= divert/
 obj-$(CONFIG_ISDN_DRV_HISAX)		+= hisax/

drivers/isdn/hardware/Makefile

@@ -4,3 +4,4 @@
 
 obj-$(CONFIG_CAPI_AVM)		+= avm/
 obj-$(CONFIG_CAPI_EICON)	+= eicon/
+obj-$(CONFIG_MISDN)		+= mISDN/