nvme: set queue limits for the admin queue

nvme: set queue limits for the admin queue

Factor out a helper to set all the device specific queue limits and apply
them to the admin queue in addition to the I/O queues.  Without this the
command size on the admin queue is arbitrarily low, and the missing
other limitations are just minefields waiting for victims.

Signed-off-by: Christoph Hellwig <[email protected]>
Reported-by: Jeff Lien <[email protected]>
Tested-by: Jeff Lien <[email protected]>
Reviewed-by: Keith Busch <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>