Add container property to aconfig_declarations.

Bug: 311155208
Test: Unit test
Change-Id: I7b187138856d0144203961e82b6dad5e2f8eed9d
diff --git a/java/Android.bp b/java/Android.bp
index cf96871..6020d00 100644
--- a/java/Android.bp
+++ b/java/Android.bp
@@ -9,6 +9,7 @@
         "blueprint",
         "blueprint-pathtools",
         "soong",
+        "soong-aconfig",
         "soong-android",
         "soong-bazel",
         "soong-cc",