runtime-rs: configure TDX machine options with kernel_irqchip=split

When TDX confidential guest support is enabled, set `kernel_irqchip=split`
for TDX CVM:
...
-machine \
   q35,accel=kvm,kernel_irqchip=split,confidential-guest-support=tdx \
...

Signed-off-by: Alex Lyn <alex.lyn@antgroup.com>

src/runtime-rs/crates/hypervisor/src/qemu/cmdline_generator.rs

@@ -2610,6 +2610,7 @@ impl<'a> QemuCmdLine<'a> {
         self.devices.push(Box::new(Bios::new(firmware.to_owned())));
 
         self.machine
+            .set_kernel_irqchip("split")
             .set_confidential_guest_support("tdx")
             .set_nvdimm(false);
     }