vmm: Enable RISC-V ACPI support

Add necessary definitions and RISC-V ACPI tables to enable ACPI feature.
More specifically, this commit add MADT definitions for RISC-V AIA
interrupt chips.

Signed-off-by: Can Zhang <icloud9957@gmail.com>

vmm/src/lib.rs

@@ -67,7 +67,6 @@ use crate::vm_config::{
     VmConfig, VsockConfig,
 };
 
-#[cfg(not(target_arch = "riscv64"))]
 mod acpi;
 pub mod api;
 mod clone3;