ASoC: msm: qdsp6v2: Apply DAP effects over WFD

Change in PROXY device enum is needed to enable
DAP over WFD. This also necessitates change in the maximum
number of DS2 devices.

Change-Id: Ia6a3e32206344e3ad5bd705f55106c0443250030
CRs-Fixed: 767250
Signed-off-by: Haynes Mathew George <hgeorge@codeaurora.org>