ARM: dts: sun5i: Add the MBUS controller

The MBUS (and its associated controller) is the bus in the Allwinner SoCs
that DMA devices use in the system to access the memory.

Among other things (and depending on the SoC generation), it can also
enforce priorities or report bandwidth usages on a per-master basis.

One of the most notable thing is that instead of having the same mapping
for the RAM than the CPU, it maps it at address 0, which means we'll have
to do address translation thanks to the dma-ranges property.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>

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