nvme: fix sector units when going between formats

If you format a device with a 4k sector size back to 512 bytes, the queue
limit values for physical block size and minimum IO size were not getting
updated; only the logical block size was being updated.  This patch adds
code to update the physical block and IO minimum sizes.

Signed-off-by: Jeff Lien <jeff.lien@wdc.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>