ASoC: wcd: disable micbias and cs on stop request

On stop request, disable micbias and current source.
Otherwise micbias is left enable for subsequent insertion
which leads to wrong detection of cable.

CRs-Fixed: 787909
Change-Id: I8ad9b4485f94fa20730e67ee7b603a6c4a2e5a2f
Signed-off-by: Yeleswarapu Nagaradhesh <nagaradh@codeaurora.org>