ASoC: qcom: apq8016-sbc: add board specific dapm mic widgets

This patch adds support to board specific dapm mic widgets so that these
can be used to specify proper connections of various micbias supported by
the board and SOC.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>