Pull NVMe updates from Christoph:
"- add support for a per-namespace character device (Minwoo Im)
- various KATO fixes and cleanups (Hou Pu, Hannes Reinecke)
- APST fix and cleanup"
* tag 'nvme-5.13-2021-04-22' of git://git.infradead.org/nvme:
nvme: introduce generic per-namespace chardev
nvme: cleanup nvme_configure_apst
nvme: do not try to reconfigure APST when the controller is not live
nvme: add 'kato' sysfs attribute
nvme: sanitize KATO setting
nvmet: avoid queuing keep-alive timer if it is disabled