nvme_disk: Use interrupts instead of polling.

Requires the preceding commit due to how it uses ConditionVariables.
Massively decreases CPU usage under heavy disk load.

Change-Id: I967e5ed000751d9f3971dd811563e23bcb13dd50
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2302
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

libnvme: Import.

Minor modifications for Haiku included, and for the most part marked
as such.