ASoC: wcd: reduce detection time for special headset

The time to detect special headset is dependent on
type of headset and also on revision of the HW.So
instead of waiting for 2sec, wait in steps of
50msec, which reduces detection time for special headset.

CRs-Fixed: 676592
Change-Id: Ia98611cc1e54da9075ac30d09ed01fde4c36cacc
Signed-off-by: Yeleswarapu Nagaradhesh <nagaradh@codeaurora.org>