usb: mdm_data_bridge: Add support for qdss trace bridge

Modify the code to support qdss trace bridge since only
one bulk in enpoint is used on qdss trace bridge.
Support qdss trace bridge on two PIDs: 0x908E and 0x909E.

Change-Id: Ib9c29b59bd277701c52a0f213eb65cb9f28df5e8
Signed-off-by: Guang Jian Zeng <gzeng@codeaurora.org>