ARM: dts: uniphier: Add PCIe endpoint and PHY node for Pro5

This adds PCIe endpoint controller and PHY nodes for Pro5 SoC,
and also adds pinctrl node for PCIe.

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