[ofw] [RFC] ib cm: export CM only interface

[Sean Hefty]

>> The interface is a direct call, callback interface.  It avoids thread
>> context switching to better support an IOCTL based consumer.  The
>> interface will immediately be used by WinVerbs for RDMA CM support,
>> and may later be used by a libibcm compatibility library.
>
>Are you planning on breaking out the IRP queueing from the CEP manager (and
>require callback use?)

For now, I'm planning on leaving the existing code as unchanged as possible -
trying to follow it is a near impossible task.  WinVerbs does its own 'IRP'
queuing, except that it never actually sees any 'IRPs' because of the KMDF
abstractions.

- Sean