diag: dci: Add support for new HSIC channel for DCI data

A new HSIC channel was created to handle DCI traffic between the
Apps processor and the remote processors. This patch adds support
to utilize this new channel for DCI data.

Change-Id: I0764ffb430c5b6b1ffe12e94b165d7b1cfab575f
Signed-off-by: Ravi Aravamudhan <aravamud@codeaurora.org>