ASoC: msm8x16-wcd: Add support to enable compander GPIO

Gain of the compander on HPH path is routed through GPIO. Add support
to configure compander GPIO to support this and also update rx bias
default register value.

CRs-Fixed: 965449
Change-Id: I159bf4d53947bb43e6adc9622783c7363eea6052
Signed-off-by: Venkata Narendra Kumar Gutta <vgutta@codeaurora.org>