nvme: re-read ANA log page after ns scan completes

[ Upstream commit 62baf70c ]

When scanning for new namespaces we might have missed an ANA AEN.

The NVMe base spec (NVMe Base Specification v2.1, Figure 151 'Asynchonous
Event Information - Notice': Asymmetric Namespace Access Change) states:

  A controller shall not send this even if an Attached Namespace
  Attribute Changed asynchronous event [...] is sent for the same event.

so we need to re-read the ANA log page after we rescanned the namespace
list to update the ANA states of the new namespaces.

Signed-off-by: Hannes Reinecke <hare@kernel.org>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>