ASoC: wcd9330: Add support for mono/stereo plug type detection

Add support for mono/stereo detection for the headphone
that is inserted into headset jack on the device.
Based on the type of the headphone, userspace can enable
or disable some of the post processing blocks in the
audio path.

CRs-Fixed: 689058
Change-Id: Ifca974fe479c27226bf2f2371097780375417ec8
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>