ASoC: msm: qdsp6v2: Add support for speaker swap

Add mixer control to swap the speaker channels.
Use MFC module to update the channel mapping.

When playback is started with speaker device and
device orientation changes, swapping L/R channel
mixer control command is sent to DSP with the MFC
module.

CRs-Fixed: 1026248
Change-Id: I1d80ecc7f1e3cfb8f8cdf71c384e92a07023be5c
Signed-off-by: kunleiz <kunleiz@codeaurora.org>
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>