arm64: dts: amlogic: sm1: fix spdif compatibles

The spdif input and output of g12 and sm1 are compatible but
sm1 should use the related compatible since it exists.

Fixes: 86f21594 ("arm64: dts: meson-sm1: add spdifin and pdifout nodes")
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20240625111845.928192-1-jbrunet@baylibre.com


Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>