ARM: dts: uniphier: add required clocks and resets to Pro4 ethernet node

The GIO clock/reset, Another MAC clock, and the PHY clock are required
for the ethernet of Pro4 SoC.
And add clock-names and reset-names to the ethernet node of PXs2 since
we need to distinguish clocks and resets now.

Suggested-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>