arm64: dts: qcom: msm8996-xiaomi: drop simple-bus from clocks

'clocks' node is not a bus, but just a placeholder for clocks:

  msm8996-xiaomi-gemini.dtb: clocks: $nodename:0: 'clocks' does not match '^([a-z][a-z0-9\\-]+-bus|bus|localbus|soc|axi|ahb|apb)(@.+)?$'
    From schema: dtschema/schemas/simple-bus.yaml
  msm8996-xiaomi-gemini.dtb: clocks: xo-board: {'compatible': ['fixed-clock'], '#clock-cells': [[0]], ...
    From schema: dtschema/schemas/simple-bus.yaml

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230324202244.744271-4-krzysztof.kozlowski@linaro.org