dt-bindings: ufs: qcom: document SC7180 UFS

dt-bindings: ufs: qcom: document SC7180 UFS

Document already upstreamed and used Qualcomm SC7180 UFS host controller
to fix dtbs_check warnings like:

  sc7180-idp.dtb: ufshc@1d84000: compatible:0: 'qcom,sc7180-ufshc' is not one of ...
  sc7180-idp.dtb: ufshc@1d84000: clocks: [[39, 99], [39, 7], [39, 98], [39, 107], [36, 0], [39, 106], [39, 105]] is too short
  sc7180-idp.dtb: ufshc@1d84000: clock-names: ['core_clk', 'bus_aggr_clk', 'iface_clk', 'core_clk_unipro', ...] is too short

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240326174632.209745-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Rob Herring <robh@kernel.org>