[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/vmbase/src/virtio/pci.rs b/vmbase/src/virtio/pci.rs
index cbb4d26..534d91a 100644
--- a/vmbase/src/virtio/pci.rs
+++ b/vmbase/src/virtio/pci.rs
@@ -63,7 +63,7 @@
 /// 3. Creates and returns a `PciRoot`.
 ///
 /// This must only be called once; it will panic if it is called a second time.
-pub fn initialise(pci_info: PciInfo, memory: &mut MemoryTracker) -> Result<PciRoot, PciError> {
+pub fn initialize(pci_info: PciInfo, memory: &mut MemoryTracker) -> Result<PciRoot, PciError> {
     PCI_INFO.set(Box::new(pci_info.clone())).map_err(|_| PciError::DuplicateInitialization)?;
 
     memory.map_mmio_range(pci_info.cam_range.clone()).map_err(PciError::CamMapFailed)?;