arm64: dts: ipq8074: Fix dma node name

DMA controller binding describes the node name should be dma-controller
and not dma, so fix the node name

Signed-off-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20201027164511.476312-10-vkoul@kernel.org


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