dt-bindings: phy: Fix node descriptions in uniphier-phy example

Prior to adding dt-bindings for SoC-dependent controllers, rename the
phy nodes and their parent nodes to the generic names in the example.

And drop parent nodes of each phy as they are not directly necessary here.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org&gt;]>
Link: https://lore.kernel.org/r/20221213082449.2721-8-hayashi.kunihiko@socionext.com


Signed-off-by: Rob Herring <robh@kernel.org>