arm64: dts: qcom: Update BAM DMA node name per DT schema

Follow dma-controller.yaml schema to use `dma-controller` as node name
of BAM DMA devices.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210831052325.21229-1-shawn.guo@linaro.org