cnss: Update SSR crash shutdown API

Update the SSR API in order to support collect target RAM dump even
when host driver or other sub-systems crash.

CRs-Fixed: 609070
Change-Id: I8480f5d9a1a6b357792c7d92981b428cfb25f376
Signed-off-by: Yue Ma <yuem@codeaurora.org>