arm64: dts: meson-sm1-odroid: add cec nodes

Enable CEC in same way it is done for other meson odroid devices

Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20211007180130.805401-1-dimitrysh@google.com