[pvmfw] Move assembly wrappers to vmbase for reuse

In both pvmfw and rialo.

Test: atest libpvmfw.bootargs.test
Test: m pvmfw_img
Bug: 282928116

Change-Id: If93cfca26cddcc27aca15baae85a0f7609160c42
diff --git a/vmbase/src/lib.rs b/vmbase/src/lib.rs
index d577802..0eca1e4 100644
--- a/vmbase/src/lib.rs
+++ b/vmbase/src/lib.rs
@@ -16,6 +16,7 @@
 
 #![no_std]
 
+pub mod arch;
 mod bionic;
 pub mod console;
 mod entry;