From the NVMe spec, "In order to make efficient use of the non-volatile
memory, it is often advantageous to execute multiple commands from a
Submission Queue in parallel. For Submission Queues that are using
weighted round robin with urgent priority class or round robin
arbitration, host software may configure an Arbitration Burst setting".
Thus add Arbitration Burst setting support.
But if the user changed it to something else that better matches how
they want to use queues, the driver is just going to undo that setting
on the next reset.
Where do we do priority class arbitration? no one sets it
