arm64: dts: renesas: r8a779a0: Add & update SCIF nodes

This is the result of multiple patches taken from the BSP, combined,
rebased, and properly sorted. SCIF0 gets DMA properties, other SCIFs are
entirely new.

Signed-off-by: Linh Phung <linh.phung.jy@renesas.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20210121110008.15894-2-wsa+renesas@sang-engineering.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>