feature(xen): dynamic platform architecture (#194)

* wip hvm

* feat: move platform stuff all into it's own thing

* hvm work

* more hvm work

* more hvm work

* feat: rework to support multiple platforms

* hvm nonredist

* more hvm work

* more hvm work

* pvh work

* work on loading cmdline

* implement initrd loading for pvh

* partially working pvh support

* fix merge issues

* pvh works!

* swap over to pv support

* remove old kernel stuff

* fix support for pv

* pvh is gone for now

* fix(runtime): debug should be respected

* fix(xen): arm64 is currently unsupported, treat it as such at runtime

* fix(examples): use architecture cfg for boot example

* fix(x86): use IOMMU only when needed for passthrough

* chore(build): print kernel architecture during fetch

crates/xen/xenclient/Cargo.toml

@@ -10,6 +10,7 @@ resolver = "2"
 
 [dependencies]
 async-trait = { workspace = true }
+c2rust-bitfields = "0.18.0"
 elf = { workspace = true }
 flate2 = { workspace = true }
 indexmap = { workspace = true }