chore(xen): move device creation into transaction interface (#196)

* chore(xen): move domain creation to xenplatform

* chore(xen): move device transactions into separate interface

crates/xen/xenplatform/src/lib.rs

@@ -6,6 +6,7 @@ pub mod sys;
 
 use crate::error::Error;
 
+pub mod domain;
 pub mod unsupported;
 #[cfg(target_arch = "x86_64")]
 pub mod x86pv;