ASoC: wcd9xxx: Continue polling for Unsupported plug types

Sometimes slow insertion of headphone could lead to
detection of unsupported plug types. In these cases,
continue polling so that headphone can be detected
once it is fully inserted.

CRs-Fixed: 745214
Change-Id: I4fe40d1afe71a5b1f5c8e8e69ba3afe16750161e
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>