arm64: dts: qcom: sc7280: Add GENI I2C/SPI DMA channels

The GENI I2C and SPI controllers may use the GPI DMA engine, define the
rx and tx channels for these controllers to enable this.

Co-developed-by: Vijaya Krishna Nivarthi <quic_vnivarth@quicinc.com>
Signed-off-by: Vijaya Krishna Nivarthi <quic_vnivarth@quicinc.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220421115526.1828659-2-vkoul@kernel.org