arm64: dts: meson: g12: add internal DAC glue

add the internal DAC glue support on the g12 and sm1 family
This glue connects the different TDM interfaces of the SoC to
the internal audio DAC codec.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Link: https://lore.kernel.org/r/20200506221656.477379-8-jbrunet@baylibre.com