cnss2: Ignore recovery when system is powering off or rebooting

There is no need to do WLAN recovery if system is powering off or
rebooting. Hence add the change to ignore.

Change-Id: I1bb16ab9cea00cb727159ad5c2a6a9925edcde2d
Signed-off-by: Yue Ma <yuem@codeaurora.org>