ARM: dts: msm: correct stereo wsa speaker setting for 8996 devices

When BUSID pin is connected to ground, wsa speaker should be
set as left. When it is connected to VDD, wsa speaker should
be set as right. Current setting is inversed.
Correct stereo wsa speaker left/right setting for 8996
MTP/CDP/Liquid.

Change-Id: Ib6e6817740952d3ba5ea91ed0b158a51d3e4f949
Signed-off-by: Meng Wang <mwang@codeaurora.org>