ASoC: msm: qdsp6v2: enable listen LAB feature

Listen module in the qdsp supports LAB (Look ahead buffering) feature
which starts capturing pcm data from microphone once keyword is
detected. Buffered data can be requested by applications in apps
processor. This change enables the LAB feature.

Change-Id: I0ede3124ecc8b71d7fae4bcc1289a0f8760bf5c0
Signed-off-by: Gopikrishnaiah Anandan <agopik@codeaurora.org>