icnss: QMI timeout, do not ASSERT when PD down

QMI timeout bound to happen when a request sent over QMI and at
the same time WLAN PD down happens. Add logic to detect PD down
event and do not ASSERT in case WLAN PD down is detected.

Change-Id: I73916ac9040250cdae16fb9c1a2c67df9ef940d3
CRs-fixed: 2017507
Signed-off-by: Prashanth Bhatta <bhattap@codeaurora.org>