arm64: dts: meson: sei610: enable audio

Add and enable the audio devices on the sei610.

The new FRDDR/TODDR D of the SM1 have been left out on purpose. The
plaftorm has 2 possible playback interfaces and 3 possible capture
interfaces. 3 pcm interfaces for each direction is enough.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>