[PATCH v3 5/9] pci, acpi, mcfg: Provide generic implementation of MCFG code initialization.

Those two functions are required by ACPI subsystem to make PCI config space accessible. Generic code assume to do nothing for early init call but late init call does as follow: - parse MCFG table and add regions to ECAM resource list - map regions - add regions to iomem_resource Signed-off-by:

[PATCH v3 5/9] pci, acpi, mcfg: Provide generic implementation of MCFG code initialization.

Those two functions are required by ACPI subsystem to make PCI config space accessible. Generic code assume to do nothing for early init call but late init call does as follow: - parse MCFG table and add regions to ECAM resource list - map regions - add regions to iomem_resource Signed-off-by: