Map devices with address offsets.

[luodeb]

eg. ARM GICC in Rust Shyper

        #[cfg(not(feature = "gicv3"))]
        PassthroughRegion { ipa: Platform::GICC_BASE, pa: Platform::GICV_BASE, length: 0x2000, dev_property: true },

Possible Solution

Add a field in memory_regions or emu_devices, pa or offect

/// A part of `AxVMConfig`, which represents a memory region.
#[derive(Debug, Default, Clone, serde::Serialize, serde::Deserialize)]
pub struct VmMemConfig {
    /// The start address of the memory region in GPA.
    pub gpa: usize,
    /// The start address of the memory region in PA.
    pub pa: usize,
    /// The size of the memory region.
    pub size: usize,
    /// The mappings flags of the memory region, refers to `MappingFlags` provided by `axaddrspace`.
    pub flags: usize,
}