device: block: Update status of the flush command
device: block: Update status of the flush command

ARM cares about the status so we need to parse the request correctly and
fill in the status.

Change-Id: I1ffabf556424184017eb64d3b9c68c72b75d0a26
Signed-off-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1139584
Reviewed-by: Stephen Barber <7719587e4b5a49340661b214ec85602f3918d06f@chromium.org>

google/crosvm,google/crosvm,google/crosvm,google/crosvm