pmem: flag pmem block devices as non-rotational

...since they are effectively SSDs as far as userspace is concerned.
Reviewed-by: NVishal Verma <vishal.l.verma@linux.intel.com>
Signed-off-by: NDan Williams <dan.j.williams@intel.com>

drivers/nvdimm/pmem.c

@@ -158,6 +158,7 @@ static int pmem_attach_disk(struct nd_namespace_common *ndns,
 	blk_queue_make_request(pmem->pmem_queue, pmem_make_request);
 	blk_queue_max_hw_sectors(pmem->pmem_queue, UINT_MAX);
 	blk_queue_bounce_limit(pmem->pmem_queue, BLK_BOUNCE_ANY);
+	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, pmem->pmem_queue);
 
 	disk = alloc_disk(0);
 	if (!disk) {