[avb] Rename the module avb_ops to ops

Bug: 260563104
Test: atest MicrodroidHostTests
Change-Id: I3cb4d3349de6d93500b287448798201667c10495
diff --git a/libs/avb/src/lib.rs b/libs/avb/src/lib.rs
index 81b554d..21b7d2a 100644
--- a/libs/avb/src/lib.rs
+++ b/libs/avb/src/lib.rs
@@ -16,6 +16,8 @@
 
 #![no_std]
 
-mod avb_ops;
+extern crate alloc;
 
-pub use avb_ops::{verify_image, AvbImageVerifyError};
+mod ops;
+
+pub use ops::{verify_image, AvbImageVerifyError};