vmbase: Move linker to aarch64

This commit move aarch64 linker definition to arch specific module.

Bug: 362733888
Test: m libvmbase

Change-Id: Ib00cbaa981c948e626d58a0f0d818d4ec1f4ceb3
diff --git a/libs/libvmbase/src/arch.rs b/libs/libvmbase/src/arch.rs
index d6095e5..10e5e37 100644
--- a/libs/libvmbase/src/arch.rs
+++ b/libs/libvmbase/src/arch.rs
@@ -23,6 +23,9 @@
 #[cfg(target_arch = "aarch64")]
 pub use aarch64::layout;
 
+#[cfg(target_arch = "aarch64")]
+pub use aarch64::linker;
+
 /// Write with well-defined compiled behavior.
 ///
 /// See https://github.com/rust-lang/rust/issues/131894