arm64: dts: qcom: sm8250: Add GPI DMA nodes

Add and configure GPI DMA nodes to enable the way for peripherals to make
DMA transfers.

Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Link: https://lore.kernel.org/r/20210614235630.445501-3-konrad.dybcio@somainline.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>