From: Armin Schindler <armin@melware.de>

With this patch the ISDN kernel CAPI code uses a per application workqueue
with proper locking to prevent message re-ordering due to the fact a
workqueue may run on another CPU at the same time.  Also some locks for
internal data is added.

Removed global recv_queue work, use per application workqueue.  Added
proper locking mechanisms for application, controller and application
workqueue function.  Increased max.  number of possible applications and
controllers.