feat(vmm): Adjust memory mapping types and optimize passthrough devic… (#272)

* feat(vmm): Adjust memory mapping types and optimize passthrough device configuration parsing

- In `linux-aarch64-a1000-smp8.toml` and `linux-aarch64-rk3588-smp8.toml`,

Changed the mapping type of `memory_regions` and removed some redundant `passthrough_devices` configurations.

- Added `VmMemMappingType::MapReserved` branch processing logic to support mapping memory regions with the same physical address.

- Refactored the `parse_passthrough_devices_address` function to prioritize the device address preset in the configuration file.

If not set, it will fall back to parsing from the device tree, improving flexibility and compatibility.

- Added debug logging to facilitate tracking of passthrough device parsing results.

* update fdt guide doc

Author: buhenxihuan