soc: qcom: Add support for QDSS bridge driver

Add support to route QDSS data received from MDM via MHI
to USB. The driver will help route diag traffic over the
QDSS sub-system to USB on APPS side. It acts as a bridge
between the PCIE MHI and USB interface.

Change-Id: I18ca278cec2b03659fabcdaf5095c310d1744b72
Signed-off-by: Satyajit Desai <sadesai@codeaurora.org>