cnss2: Avoid ASSERT in panic handler

Avoid calling ASSERT from select_window API when it called
from panic handler. As device is already crashed, calling
ASSERT will just add unwanted prints and dump stacks.

Change-Id: If38be6d8e452c49cabfa059b4bf12b2f8a3c60a2
Signed-off-by: Naman Padhiar <npadhiar@codeaurora.org>