nvme: Display raw APST configuration via DYNAMIC_DEBUG

nvme: Display raw APST configuration via DYNAMIC_DEBUG

BugLink: https://bugs.launchpad.net/bugs/1699004
Debugging APST is currently a bit of a pain.  This gives optional
simple log messages that describe the APST state.

The easiest way to use this is probably with the nvme_core.dyndbg=+p
module parameter.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
(cherry picked from commit fb0dc3993b537e12ce63511d535ff86efff13c8f)
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>