ASoC: wcd9335: Add support mono/stereo plug detection

Headphone can be mono/stereo type. Add support to detect
whether inserted plug is mono or stereo.

Change-Id: I9fff758748b7fd20da81f3f7b2c7fcac290cc3c3
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>