ASoC: wcd9335: Add support for impedance detection for version 2.0

Enhance the impedance detection logic for wcd9335 codec version 2.0
to improve accuracy and also detecting impedances on varied headsets
like floating, mono and stereo headset combinations.

Change-Id: I16badd6e7906f5aa2a65edb992071cd21898cd6f
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>