ASoC: msm8x10-wcd: Add clock widgets for playback paths

Add the clock widgets for audio playback output paths so that
the clock control for headphone, earpiece, lineout, and speaker
is a part of DAPM power-up and power-down sequence to reduce
the CnP.

Change-Id: I1d146fd329375e188a3d3fe1a7c23711c0ed4c86
CRs-fixed: 518654
Signed-off-by: Kuirong Wang <kuirongw@codeaurora.org>