arm64: dts: qcom: sc8280xp: label the Soundwire nodes

Use labels, instead of comments, for Soundwire controllers.  Naming them
is useful, because they are specialized and have also naming in
datasheet/programming guide.

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/20230405060906.143058-1-krzysztof.kozlowski@linaro.org