ASoC: wcd: correct handling of GND_MIC_SWAP

During playback HPHR schmitt trigger can give wrong results
and can identify as cross connection. So judge cable as
GND_MIC_SWAP only after GND_MIC_SWAP_THRESHOLD count.

CRs-Fixed: 755296
Change-Id: I9ff0457b488745ca1d23d960aae8d664fbabfcfd
Signed-off-by: Yeleswarapu Nagaradhesh <nagaradh@codeaurora.org>