Revert "ASoC: msm: qdspv2: add spin lock to protect ac"

This reverts commit c6316fe1
("ASoC: msm: qdspv2: add spin lock to protect ac"). Add another
patch apply cleanly to fix the ac used-after-free issue.

Change-Id: I494e4666e76490c37f17a774ce640f4af276e6ae
Signed-off-by: Meng Wang <mwang@codeaurora.org>