Add "DAC mux" DAPM widget in CS42l51 audio codec routes,
to support DAC mux control and to remove error trace
"DAC Mux has no paths" at widget creation.
Note: ADC path of DAC mux is not routed in this patch.
Signed-off-by: NOlivier Moysan <olivier.moysan@st.com>
Link: https://lore.kernel.org/r/20191203141627.29471-1-olivier.moysan@st.comSigned-off-by: NMark Brown <broonie@kernel.org>