The sound and codec nodes are not a property of a soc, but rather board
as it describes the sound configuration.  It also does not have unit
address:

  sm8250-hdk.dtb: soc@0: sound: {} should not be valid under {'type': 'object'}
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221210115704.97614-4-krzysztof.kozlowski@linaro.org