SPEAr13XX PCIe DT detail:
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SPEAr13XX uses synopsis designware PCIe controller and ST MiPHY as phy
controller.

Required properties:
- compatible : should be "st,spear1340-pcie", "snps,dw-pcie".
- phys		    : phandle to phy node associated with pcie controller
- phy-names	    : must be "pcie-phy"
- All other definitions as per generic PCI bindings

 Optional properties:
- st,pcie-is-gen1 indicates that forced gen1 initialization is needed.