arm64: dts: qcom: msm8994: Drop spi-max-frequency from SPI host

This is a device property, not a bus host one.

Signed-off-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/20221117105845.13644-1-konrad.dybcio@linaro.org