ARM: dts: uniphier: Add Pro5 board support

Initial version of devicetree sources for Pro5 EPCORE and ProEX boards.
These boards have UART, I2C, USB, eMMC and PCI endpoint in common.

Pro5 EPCORE board is a kind of Pro5 reference board with PCIe endpoint
card edge connector.

ProEX board shares peripherals with Linux and other systems, and some
of these ports are available in Linux.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/20221117163219.3673-3-hayashi.kunihiko@socionext.com


Signed-off-by: Arnd Bergmann <arnd@arndb.de>