Support multi-port PCIe hierarchy in Marvell boards DTS

[mw_semihalf.com]

Summary

This commit is another part of preparation for PCIe multi-port
support for Marvell SoCs. Some device trees include pcie-controller
node as a bus-parent of pcie nodes. This patch adds support for
new bus, collects and configures device informations and finally
adds PCIB devices as a childs of pcie-controller in Newbus hierarchy.

[mw_semihalf.com]

Commited to revision 319706