virtio: revert config interrupt changes

Lots of fallout from config interrupt changes. Author wants to rework
the patches. Let's revert quickly so others don't suffer meanwhile.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

# gpg: Signature made Mon 10 Jan 2022 21:03:44 GMT
# gpg:                using RSA key 5D09FD0871C8F85B94CA8A0D281F0DB8D28D5469
# gpg:                issuer "mst@redhat.com"
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>" [full]
# gpg:                 aka "Michael S. Tsirkin <mst@redhat.com>" [full]
# Primary key fingerprint: 0270 606B 6F3C DF3D 0B17  0970 C350 3912 AFBE 8E67
#      Subkey fingerprint: 5D09 FD08 71C8 F85B 94CA  8A0D 281F 0DB8 D28D 5469

* remotes/mst/tags/for_upstream:
  Revert "virtio: introduce macro IRTIO_CONFIG_IRQ_IDX"
  Revert "virtio-pci: decouple notifier from interrupt process"
  Revert "virtio-pci: decouple the single vector from the interrupt process"
  Revert "vhost: introduce new VhostOps vhost_set_config_call"
  Revert "vhost-vdpa: add support for config interrupt"
  Revert "virtio: add support for configure interrupt"
  Revert "vhost: add support for configure interrupt"
  Revert "virtio-net: add support for configure interrupt"
  Revert "virtio-mmio: add support for configure interrupt"
  Revert "virtio-pci: add support for configure interrupt"

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