arm64: dts: qcom: sm8550: use uint16 for Soundwire interval

The Soundwire bindings changed during review, after the SM8550 DTS
Soundwire nodes were merged.  Switch to uint16 for Soundwire
qcom,ports-sinterval property, to match with current bindings.

Fixes: 61b00638 ("arm64: dts: qcom: sm8550: add Soundwire controllers")
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/20230418095734.669858-1-krzysztof.kozlowski@linaro.org