Add AArch64 device Rust toolchain.

Bug: 141207434
Test: build example rust device module.
Change-Id: I0932a614942bf4a4d4b6c153fcc4fc79c7f202bd
diff --git a/cc/cc.go b/cc/cc.go
index e1d184a..5763d0c 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -401,6 +401,14 @@
 	return staticDepTag
 }
 
+func CrtBeginDepTag() dependencyTag {
+	return crtBeginDepTag
+}
+
+func CrtEndDepTag() dependencyTag {
+	return crtEndDepTag
+}
+
 // Module contains the properties and members used by all C/C++ module types, and implements
 // the blueprint.Module interface.  It delegates to compiler, linker, and installer interfaces
 // to construct the output file.  Behavior can be customized with a Customizer interface