diag: Add logs & events streaming support for DCI

Diag driver is adding a new feature to stream logs & events to a
user space application on Linux processor. This will eliminate
need to connect QXDM to receive diag traffic.
This is known as Diag Consumer Interface (DCI).

Change-Id: I7983bb7d9b8a0429ebbee290868c8bd0e562953f
Signed-off-by: Shalabh Jain <shalabhj@codeaurora.org>