Current driver keeps cmd_id as 0 for all non-scan commands which
makes serialization module's logic more complex in order to identify
between duplicate commands.
Add unique cmd_id and attach it to each legacy sme command to make
serialization module's logic easy to distinguish between duplicate
commands.
CRs-Fixed: 2267418
Change-Id: Id2ccb435137061c963120822326fe5b90f857eb7