[virt] Adjust spelling of initialise in code and comments

This cl updates the spelling of "initialise" to "initialize" in
the code and comments.

Test: m com.android.virt pvmfw_img
Change-Id: If0ce2a3e8188ddabd4d4e24912eb4973942bd550
diff --git a/microdroid_manager/src/main.rs b/microdroid_manager/src/main.rs
index 9c19feb..ca57e94 100644
--- a/microdroid_manager/src/main.rs
+++ b/microdroid_manager/src/main.rs
@@ -228,7 +228,7 @@
 
     load_crashkernel_if_supported().context("Failed to load crashkernel")?;
 
-    swap::init_swap().context("Failed to initialise swap")?;
+    swap::init_swap().context("Failed to initialize swap")?;
     info!("swap enabled.");
 
     let service = get_vms_rpc_binder()