Currently all drivers which uses a slot from the debug window have fragile
hardwired slot 'mapping', they are locked to use specific slots even if
there are free slots available for them to take.
The new API hides the management of the slots and descriptors and users
can ask, release or even seize slots that they want to use.
Add a new debug slot manager API and a new default no config option to
allow selection between the hardwired or dynamic debug slot management.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
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