remove PCIE config access and hardcoded PCIE base

[jyao1]

https://github.com/intel/MigTD/blob/main/src/devices/pci/src/config.rs#L13C7-L13C30

Also
https://github.com/intel/MigTD/blob/main/src/devices/pci/src/mmio.rs#L10-L11

[gaojiaqi7]

Perhaps we can use a config file to determine the MMIO space instead of the ACPI table provided by VMM? Just like the image/memory layout configuration.

If one uses the virtio and has different configuration of MMIO space from QEMU, just replace the config file.

[jyao1]

yes, let's use configuration file.