NVMe: Reread partitions on metadata formats

NVMe: Reread partitions on metadata formats

This patch has the driver automatically reread partitions if a namespace
has a separate metadata format. Previously revalidating a disk was
sufficient to get the correct capacity set on such formatted drives,
but partitions that may exist would not have been surfaced.

Reported-by: Paul Grabinar <paul.grabinar@ranbarg.com>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Cc: Matthew Wilcox <willy@linux.intel.com>
Tested-by: Paul Grabinar <paul.grabinar@ranbarg.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
(cherry picked from commit 7bee607472aa2e5a36dfe143e5a625be06125f53)

Orabug: 22620486
Signed-off-by: Jason Luo <zhangqing.luo@oracle.com>