arm64: dts: qcom: sdm845-polaris: Don't duplicate DMA assignment

The DMA properties in this DT are identical to the ones already
defined in sdm845.dtsi. Remove them.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221114140011.43442-1-konrad.dybcio@linaro.org