Revert "ASoc: msm: Increase default buffersize to 4k for audio playback"

This reverts commit ba0748895967a90204b3fcd229d3fb941e6b6fe3.

Conflicts:
	sound/soc/msm/msm-pcm-q6.c

Change-Id: I8464ea8e9e342ff7318d21cc98112248aec7fe3b