ASoC: msm8226: Add support for MIC-GND swap switch

If the board has a switch to swap the GND and MIC connections for
headset jack, enable the support to flip the switch through gpio
to swap GND and MIC.

CRs-fixed: 490562
Change-Id: If173c1aa89946a36d1549077d3e8294d14d1d1b7
Signed-off-by: Bhalchandra Gajare <gajare@codeaurora.org>