diag: Change CDSP socket instance id

Currently, CDSP socket instance id on APPS is not
matching with instance id on CDSP peripheral due
to which APPS is thinking that channel has been
opened with WDSP. This patch fixes this discrepancy.

CRs-Fixed: 1111626
Change-Id: I990ae8fd23c95f16be72b4fe207926444244c23e
Signed-off-by: Mohit Aggarwal <maggarwa@codeaurora.org>