ASoC: msm: correct direction of couple CPU DAIs

It is found that FM playback is broken. Kernel panic
happens when soc dpcm framework tries to start up back-end
substream. The reason is that substream for desired direction
,in this case is capture path, does not exist due to CPU DAI
declares itself supporting only playback path. In reality,
given CPU DAI is meant for capture path. Make change to
correct direction of couple CPU DAIs

Change-Id: I514ab2cc02fcca7229f12d3d0bdd4eb4c5b36475
Signed-off-by: Patrick Lai <plai@codeaurora.org>