ARM: dts: r9a06g032: Fill the UART DMA properties

ARM: dts: r9a06g032: Fill the UART DMA properties

UART 0 to 2 do not have DMA support, while UART 3 to 7 do.

Fill the "dmas" and "dma-names" properties for each of these nodes.

Please mind that these nodes go through the dmamux node which will
redirect the requests to the right DMA controller. The first 4 cells of
the "dmas" properties will be transferred as-is to the DMA
controllers. The last 2 cells are consumed by the dmamux. Which means
cell 0 and 4 are almost redundant, one giving the controller request ID
and the other the dmamux channel which is a 1:1 translation of the
request IDs, shifted by 16 when pointing to the second DMA controller.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20220421095323.101811-11-miquel.raynal@bootlin.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>