ASoC: wm9713: correct mono out PGA sources
ASoC: wm9713: correct mono out PGA sources

The mono output PGA input only has four possible sources, so
omit the rest.

Signed-off-by: Matt Reimer <35bbc1be0dd37cdb3c86912819be591dd5b3d7a3@sdgsystems.com>
Signed-off-by: Mark Brown <b51b9a92386687a9ac927cebfa0f978adeb8cea5@linaro.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs