ASoC: wcd9335: Add support for lineout volume adjustment

Add mixer controls to adjust wcd9335 codec lineout PA
volume adjustment. This gives flexibility for user
to modify volume based on use-case.

CRs-fixed: 969512
Change-Id: I562f17363d7d38caece358a50d1e3f654d87491f
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>