diag: dci: Validate dci response length before parsing

Prevent possible out of bound access due to missing length check
while extracting dci packet response by adding proper checks.

CRs-Fixed: 2434571
Change-Id: I7b6972bf6559bdca99333a75d989cd6d3431b801
Signed-off-by: Manoj Prabhu B <bmanoj@codeaurora.org>