Revert "Remove key migration related changes"

This reverts commit 65dcdf2921ab1208b28813b05034045210f74a8a.

Reason for revert: broken internal target 

Change-Id: Idf57285d95f5466dfa3af08230af4c8f9d76326c
diff --git a/private/system_server.te b/private/system_server.te
index 479cbf9..d3ad100 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -963,7 +963,9 @@
 	clear_ns
 	clear_uid
 	get_state
+	list
 	lock
+	migrate_any_key
 	pull_metrics
 	reset
 	unlock