Convert the Arm Versatile PCI host binding to a DT schema.

Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Andrew Murray <andrew.murray@arm.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NRob Herring <robh@kernel.org>