Add release_config_contributions modules

These are used to enumerate what directories may contribute to release
configs, whether or not they are actually used in the build.

Bug: b/370544058
Test: manual, TH
Change-Id: I1509eb3795a9b51b29995b182b77ade76021bb52
diff --git a/aconfig/build_flags/declarations.go b/aconfig/build_flags/declarations.go
index e927db2..4a54269 100644
--- a/aconfig/build_flags/declarations.go
+++ b/aconfig/build_flags/declarations.go
@@ -35,7 +35,7 @@
 
 	// Properties for "aconfig_declarations"
 	properties struct {
-		// aconfig files, relative to this Android.bp file
+		// build flag declaration files, relative to this Android.bp file
 		Srcs []string `android:"path"`
 	}
 }