ASoC: wcd: Add polling for proper headset detection

Add polling to detect headset properly.
This fixes slow insertion of headset detected as Linout cable.
Fixes issues relating to slow insertion like headset fail to
detect after insertion and removal slowly 2-3 times.

CRs-Fixed: 653693
Change-Id: I80940ff0c903b78aec53a928081a1c6a1ea5276f
Signed-off-by: Yeleswarapu Nagaradhesh <nagaradh@codeaurora.org>