soc: qcom: audio: use global lock for single hab socket

Need use one global lock to prevent multiple threads visit single hab
socket at same time, as hab can't guarantee that the coming message is
received by the right thread.

Change-Id: I43eca3c1f7010c651612fff949b867e2269a2977
Signed-off-by: Erin Yan <xinyey@codeaurora.org>