dt-bindings: net: realtek: Use proper node names

dt-bindings: net: realtek: Use proper node names

We eventually want to get to a place where we fix all DTS files
so that we can simply disallow switch/port/ports without the
ethernet-* prefix so the DTS files are more readable.

Replace:
- switch with ethernet-switch
- ports with ethernet-ports
- port with ethernet-port

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patch.msgid.link/20241004-realtek-bindings-fixup-v2-1-667afa08d184@linaro.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>