[virtio] Move virtio module from pvmfw to vmbase

for reuse in both pvmfw and rialo.

No code change in this cl.

Bug: 284462758
Test: m pvmfw_img
Change-Id: I225b495a2f8c1a49cb63ea69d60f01949bab3f05
diff --git a/vmbase/src/lib.rs b/vmbase/src/lib.rs
index 80cdf4e..ebb3707 100644
--- a/vmbase/src/lib.rs
+++ b/vmbase/src/lib.rs
@@ -29,6 +29,7 @@
 pub mod power;
 pub mod uart;
 pub mod util;
+pub mod virtio;
 
 pub use bionic::STACK_CHK_GUARD;