msm: npu: Don't poll status register if watchdog is triggered

Once NPU watchdog is triggered, polling status register must
time out. So it's not needed to keep polling status register in
this scenario.

Change-Id: Icb60b31b87bf7929bbce9f080ea98befe4462d6a
Signed-off-by: Jilai Wang <jilaiw@codeaurora.org>