icnss: Reduce timeout for waiting response message from firmware

Reduce timeout for waiting response message from firmware. For some
consecutive PD_SERVICE_DOWN scenario, before WLAN driver complete
reinit(), if another PD_SERVICE_DOWN event is received before
mode_req response from firmware, icnss may block driver event work,
which triggers firmware side timeout for PD_SERVCE_DOWN response, then
firmware force assert itself.

Change-Id: I29dda483bd33b1c534d6ec14363a808f9a04e9d4
CRs-Fixed: 2368740
Signed-off-by: hangtian <hangtian@codeaurora.org>