ASoC: wcd9330: Add ANC loopback path and cache HPF bypass control

Add route to connect ANC FB tune signal back to decimator
DEC7 to DEC10. These paths are used to evalute the device acoustics
and provide a way to tune ANC algorithm. In addition, a logic is
implemented to cache the TX HPF bypass control to allow user
bypass the TX HPF during ANC tuning.

Change-Id: I9aacd9d8717bfadbf4de750d7dfccd1f38da4bc8
Signed-off-by: Jay Wang <jaywang@codeaurora.org>