nvme_test: update shadow doorbell handling to mirror nvme crate #2006
Description
We took the decision to split the implementations of the nvme emulator in to nvme and nvme_test crates. This means that changes to the nvme crate need to also be applied to the nvme_test crate.
Currently the test crate is running behind. Changes from commit 94889ca need to be applied to the test emulator as well in order to have better shadow doorbell support in the test crate.