ASoC: msm8x16-wcd: update the gain on EAR sound device

Update the EAR path device with proper gain settings when
proper configuration is set from the userspace.

CRs-Fixed: 689069
Change-Id: I644903f23906467e63a2711d3319a8408351f973
Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org>