dahdi_dynamic: Since dynamic devices are 'parentless' we must name them.

This in conjunction with r10449 "A parent-less device should not crash dahdi",
this allows dahdi_dynamic spans to work post the dahdi_devices changes in
2.6.0.

The full address of the device is not used since kernels prior to 2.6.31 limit
the length of a devicename to 20 characters.  The full address of the device
can be pulled out of the "hardware_id" and "type" fields of the span.

This patch is just to get things working again. dahdi_dynamic devices *may*
still have issues if the auto_assign_spans module parameter is 0.

Internal-Issue-ID: DAHLIN-280
Reported-by: Pavel Selivanov
Signed-off-by: Shaun Ruffell <sruffell@digium.com>

git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@10563 a0bf4364-ded3-4de4-8d8a-66a801d63aff

include/dahdi/kernel.h

@@ -1096,6 +1096,9 @@ struct dahdi_dynamic_driver {
 
 	struct list_head list;
 	struct module *owner;
+
+	/*! Numberic id of next device created by this driver. */
+	unsigned int id;
 };
 
 /*! \brief Receive a dynamic span message */