arm64: dts: mediatek: mt8186: Add and use UART AP_DMA controller

This SoC has a DMA controller (AP_DMA) that provides one channel
for each data direction (transmit and receive) for all of the
UART controllers in the SoC.

In order to increase the efficiency of data TX/RX over the UART
controllers, add the UART DMA controller and assign the right
channels to each of the three UART controllers.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

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