ASoC: wcd9320: Use class AB headphone path for high-res formats

* The class AB path is less efficient, but has a lower noise floor.
* Enable this path for 24-bit or high (>96KHz) sample rate, as this
  tradeoff is worth it with lossless, high resolution music.

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
Build v3.95 EXP2