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

Prior to adding dt-bindings for SoC-dependent controllers, rename the
clock nodes to the generic names in the example.

And drop redundant examples and a parent node of the clock as it is not
directly necessary.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221213082449.2721-2-hayashi.kunihiko@socionext.com


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