icnss: Add support for force error fatal from WLAN FW

For certain FW failures, SSR dump alone is not sufficient for root
causing the failure reason. For those cases, add support to force
download mode when FW indicates these failures thru a smp2p triggered
error indication.

CRs-Fixed: 2159316
Change-Id: I0a4b040a30f9a5fb5ad3d87273f3dea66f26e98e
Signed-off-by: Sameer Thalappil <sameert@codeaurora.org>