arm64: dts: qcom: sc7280: Remove redundant soundwire property

Remove redundant and undocumented property qcom,port-offset in
soundwire controller nodes.
This patch is required to avoid dtbs_check errors with
qcom,soundwire.yaml

Fixes: 12ef689f ("arm64: dts: qcom: sc7280: Add nodes for soundwire and va tx rx digital macro codecs")
Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
Co-developed-by: Ratna Deepthi Kudaravalli <quic_rkudarav@quicinc.com>
Signed-off-by: Ratna Deepthi Kudaravalli <quic_rkudarav@quicinc.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/1667918763-32445-4-git-send-email-quic_srivasam@quicinc.com