ASoC: arizona: Add widget<->mux route into mux route macro

The routes linking the widget and the input mux were being added
manually, rather than by the ARIZONA_MUX_ROUTES macro. This patchs adds
the routes to the macro.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>