diag: Add separation of cmd/rsp

Currently, the command/response messages all occur on the
smd data channels. Process the command/response messages on
separate smd channels if the peripheral supports this
separation.

Change-Id: Ibb6f50f24d06b806c597589341496ba9ff54f240
Signed-off-by: Dixon Peterson <dixonp@codeaurora.org>
11 files changed