soc: qcom: qdss_bridge: Add spin_lock for accessing lists

Add spin_lock to handle concurrent access lists when
switching between two mode. In addition, add check when
calling usb_qdss_close.

Change-Id: I6d455352da360f047807a8ae1ebc50b196531130
Signed-off-by: Shaoqing Liu <shaoqingliu@codeaurora.org>