arm64: dts: qcom: sm6350: Add GPI DMA nodes

Add nodes for the gpi_dma0 and gpi_dma1 which are (optionally) used for
various i2c busses based on the qup firmware configuration.

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220812082721.1125759-4-luca.weiss@fairphone.com