Add policy for property ro.android.security.keystore2.enable

Bug: 171563717
Bug: 171305684
Test: N/A
Change-Id: I323081fd2ce2fee80951c3d1e19b9935e4596705
diff --git a/private/property_contexts b/private/property_contexts
index 397beb1..2d90875 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -920,3 +920,7 @@
 
 # zygote config property
 zygote.critical_window.minute u:object_r:zygote_config_prop:s0 exact int
+
+# Enable Keystore 2.0.
+# TODO remove this propertye when Keystore 2.0 migration is complete b/171563717
+ro.android.security.keystore2.enable    u:object_r:keystore2_enable_prop:s0 exact bool