arm64: dts: qcom: sm8250: drop unused clock-frequency from rx-macro

Neither qcom,sm8250-lpass-rx-macro bindings nor the driver use
"clock-frequency" property.

  sm8250-mtp.dtb: rxmacro@3200000: Unevaluated properties are not allowed ('clock-frequency' was unexpected)

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/20230118094224.51704-1-krzysztof.kozlowski@linaro.org