arm64: dts: qcom: sdm845: correct Soundwire node name

arm64: dts: qcom: sdm845: correct Soundwire node name

Soundwire Devicetree bindings expect the Soundwire controller device
node to be named just "soundwire":

  sdm845-db845c.dtb: swm@c85: $nodename:0: 'swm@c85' does not match '^soundwire(@.*)?$'

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Acked-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20231111095617.16496-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>