dt-bindings: net: via-rhine: Convert to YAML

Rewrite the textual description for the VIA Rhine platform Ethernet
controller as YAML schema, and switch the filename to follow the
compatible string. These are used in several VIA/WonderMedia SoCs

Signed-off-by: Alexey Charkov <alchark@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20250430-rhine-binding-v2-1-4290156c0f57@gmail.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>