nvme-5.13-2021-04-15

nvme updates for Linux 5.13

 - refactor the ioctl coee
 - fix a segmentation fault during io parsing error in nvmet-tcp
   (Elad Grupi)
 - fix NULL derefence in nvme_ctrl_fast_io_fail_tmo_show/store
   (Gopal Tiwari)
 - properly respect the sgl_threshold flag in nvme-pci (Niklas Cassel)
 - misc cleanups (Niklas Cassel, Amit Engel, Minwoo Im, Colin Ian King)
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