Add keystore2 LIST permission to system_server

This is required for listing all key aliases of other APP domains' keys
in order to migrate keys on behalf of the updated app by PMS.

Test: builds
Bug: 211665859
Change-Id: I541fb81e6186288a1e852ce60882651f838e36dc
diff --git a/private/system_server.te b/private/system_server.te
index 68792e8..bec7ba4 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -915,6 +915,7 @@
 	clear_ns
 	clear_uid
 	get_state
+	list
 	lock
 	migrate_any_key
 	pull_metrics