Merge remote-tracking branch 'remotes/nvme/tags/nvme-next-pull-request' into staging

hw/nvme fixes

* new PMR test (Gollu Appalanaidu)
* pmr/sgl mapping fix (Padmakar Kalghatgi)
* hotplug fixes (me)
* mmio out-of-bound read fix (me)
* big-endian host fixes (me)

# gpg: Signature made Mon 26 Jul 2021 20:18:12 BST
# gpg:                using RSA key 522833AA75E2DCE6A24766C04DE1AF316D4F0DE9
# gpg: Good signature from "Klaus Jensen <its@irrelevant.dk>" [unknown]
# gpg:                 aka "Klaus Jensen <k.jensen@samsung.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: DDCA 4D9C 9EF9 31CC 3468  4272 63D5 6FC5 E55D A838
#      Subkey fingerprint: 5228 33AA 75E2 DCE6 A247  66C0 4DE1 AF31 6D4F 0DE9

* remotes/nvme/tags/nvme-next-pull-request:
  tests/qtest/nvme-test: add mmio read test
  hw/nvme: fix mmio read
  hw/nvme: fix out-of-bounds reads
  hw/nvme: use symbolic names for registers
  hw/nvme: split pmrmsc register into upper and lower
  hw/nvme: fix controller hot unplugging
  tests/qtest/nvme-test: add persistent memory region test
  hw/nvme: error handling for too many mappings
  hw/nvme: unregister controller with subsystem at exit
  hw/nvme: mark nvme-subsys non-hotpluggable
  hw/nvme: remove NvmeCtrl parameter from ns setup/check functions

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>