ASoC: wcd9xxx: Fix the ANC CnP

Add virtual ANC widgets which are used to enable ANC
before PA is turned on, and to disable ANC before TX is
turned off.

CRs-fixed: 387904
Change-Id: Id3eca8c09d1d1d3c3d89ebe3d58be9bf676eb9c0
Signed-off-by: Damir Didjusto <damird@codeaurora.org>
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>