mISDN: Add ISDN sample clock API to mISDN core

Add ISDN sample clock API to mISDN core (new file clock.c)
hfcmulti and mISDNdsp use clock API.

Signed-off-by: Andreas Eversberg <andreas@eversberg.eu>
Signed-off-by: Karsten Keil <kkeil@suse.de>
diff --git a/drivers/isdn/mISDN/core.c b/drivers/isdn/mISDN/core.c
index 43fd97b..9116f54 100644
--- a/drivers/isdn/mISDN/core.c
+++ b/drivers/isdn/mISDN/core.c
@@ -199,6 +199,7 @@
 
 	printk(KERN_INFO "Modular ISDN core version %d.%d.%d\n",
 		MISDN_MAJOR_VERSION, MISDN_MINOR_VERSION, MISDN_RELEASE);
+	mISDN_init_clock(&debug);
 	mISDN_initstack(&debug);
 	err = mISDN_inittimer(&debug);
 	if (err)