dt-bindings: PCI: uniphier-ep: Clean up reg, clocks, resets, and their names

dt-bindings: PCI: uniphier-ep: Clean up reg, clocks, resets, and their names

Instead of "oneOf:" choices, use "allOf:" and "if:" to define reg, clocks,
resets, and their names that can be taken by the compatible string.

The order of their names doesn't change here.

Link: https://lore.kernel.org/r/20221223070713.20549-2-hayashi.kunihiko@socionext.com
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rob Herring <robh@kernel.org>