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/xencall/Cargo.toml

@@ -33,7 +33,3 @@ path = "examples/domain_create.rs"
 [[example]]
 name = "xencall-version-capabilities"
 path = "examples/version_capabilities.rs"
-
-[[example]]
-name = "xencall-vcpu-context"
-path = "examples/vcpu_context.rs"