arm64: dts: qcom: sm8350: Define GPI DMA engines

The Qualcomm SM8350 has three GPI DMA engines, add definitions for
these.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20220412215137.2385831-1-bjorn.andersson@linaro.org