msm: npu: Don't send interrupt if command has been consumed

It is possible that the command is consumed by firmware before
the interrupt is triggered. If the command is power off
notification, npu will be woken up unexpected and run into error
state.

Change-Id: I994ee862d3cc172f2562ca378b5b88d71111f269
Signed-off-by: Jilai Wang <jilaiw@codeaurora.org>