dt-bindings: remoteproc: Document AMD MicroBlaze/V BRAM-based rproc

Describe an AMD MicroBlaze/V BRAM-based remote processor controlled
through the remoteproc framework.

The binding models a soft-core processor subsystem instantiated in AMD
programmable logic and using dual-port BRAM for firmware storage and
execution. The remoteproc device is represented as a child node whose
reg property describes the firmware memory window in the processor-local
address space. The parent bus node provides standard devicetree address
translation through ranges so Linux can access the same BRAM through the
system physical address space.

A clock input feeds the soft-core processor subsystem, and an active-low
reset GPIO holds the processor in reset until firmware loading completes.
The firmware-name property is optional.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Ben Levinsky <ben.levinsky@amd.com>
Link: https://lore.kernel.org/r/20260714202441.554065-2-ben.levinsky@amd.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

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