Properly package aconfig files for vendor partition

Bug: 311173471
Test: Unit tests
Change-Id: Ibb857b69c3f83326a9ff5732e11dd09887e4ba6e

rust/androidmk.go

@@ -17,6 +17,7 @@ package rust
 import (
 	"path/filepath"
 
+	"android/soong/aconfig"
 	"android/soong/android"
 )
 
@@ -66,8 +67,7 @@ func (mod *Module) AndroidMkEntries() []android.AndroidMkEntries {
 				if mod.UseVndk() {
 					entries.SetBool("LOCAL_USE_VNDK", true)
 				}
-				// TODO(b/311155208): The container here should be system.
-				entries.SetPaths("LOCAL_ACONFIG_FILES", mod.mergedAconfigFiles[""])
+				aconfig.SetAconfigFileMkEntries(mod.AndroidModuleBase(), entries, mod.mergedAconfigFiles)
 			},
 		},
 	}