icnss: Remove check for driver unloading in-progress

During SSR/PDR, icnss send FW_DOWN uevent to host driver
to indicate firmware is down. If host driver is unloading
in-progress, this event will not be sent. Remove check for
unloading in-progress before sending uevent.

Change-Id: Ie118e048a7ffbf61d791513a3c1e751c03a2b12c
Signed-off-by: Naman Padhiar <npadhiar@codeaurora.org>