Revert "Remove key migration related changes"

This reverts commit cabed18a473ed4e474f6b93bbaad453db3efd0d6.

Reason for revert: b/233922399

Change-Id: Ib371184de3c1bc4e3e0ca951e98d6b5e66952dcc
diff --git a/private/system_server.te b/private/system_server.te
index 06cc055..e77ba5d 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -957,7 +957,9 @@
 	clear_ns
 	clear_uid
 	get_state
+	list
 	lock
+	migrate_any_key
 	pull_metrics
 	reset
 	unlock