dt-bindings: PCI: brcm,iproc-pcie: Drop common pci-bus properties

Drop the unnecessary listing of properties already defined in
pci-bus.yaml. Unless there are additional constraints, it is not
necessary.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://lore.kernel.org/r/20230926155351.31117-2-robh@kernel.org


Signed-off-by: Rob Herring <robh@kernel.org>