Add container to .aconfig

Change-Id: If809f6229cd69ba9fe8a78c8c598b6a5d8d2d334
Test: m
Bug: 328444881
diff --git a/services/accessibility/accessibility.aconfig b/services/accessibility/accessibility.aconfig
index 04b19ff..1d6399e 100644
--- a/services/accessibility/accessibility.aconfig
+++ b/services/accessibility/accessibility.aconfig
@@ -1,4 +1,5 @@
 package: "com.android.server.accessibility"
+container: "system"
 
 # NOTE: Keep alphabetized to help limit merge conflicts from multiple simultaneous editors.