asoc: msm-lsm-client: abort LAB buffering before stop session and close TX

Currently we only set read_abort flag to stop LAB buffering before we call
q6lsm_stop_lab. There is a possibility that this step is skipped under
certain circumstances. This might cause ADSP crash as a result. Therefore,
set flag read_abort before calling q6lsm_stop and q6lsm_close to make sure
LAB buffering is stopped before closing a SVA session.

Change-Id: I7364c31348f908d8920e32f811745549cf305901
Signed-off-by: Xiaoyu Ye <benyxy@codeaurora.org>