add option to program the the PCI bars #748
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In case of aarch64, the PCI bar has to program during the initialization. The regions are part of the device trees. See https://wiki.osdev.org/PCI for details.
- reduce the complexity of the code
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In case of aarch64, the PCI bar has to program during the initialization. The regions are part of the device trees.
This PR solves also #739 because it enable also the support for virtue-net-pci device for aarch64.
PCI details are available at https://wiki.osdev.org/PCI.