[Cherrypick] Manually cherrypick c53b1c5114bdf7fc945cbf11436da61789ca2267
Revert "[Cherrypick] Manually cherrypick c53b1c5114bdf7fc945cbf11436da61789ca2267"

This reverts commit 0e1af4bb27c906601db5cd6346fe5f59f5ead6cc.
Revert "dataplane: handle misaligned virtio-blk requests"

This reverts commit d8dc343a14728ca63589ad21b5504f3934820acb.
Revert "dataplane: fix build breakage on set_guest_notifiers()"

This reverts commit b8bec49cccbf8e34558371df60e7e64419c4fde9.