Pull up following revision(s) (requested by nonaka in ticket #1386):

sys/dev/ic/nvme.c: revision 1.45

Don't set Phase Tag bit of Completion Queue entry at nvme_poll_done().

A new completion queue entry check incorrectly determined that there was
a Completion Queue entry for a command that was not submitted.

Fix PR kern/54275, PR kern/54503, PR kern/54532.

(martin)