Add security class keystore2_key.

Keystore 2.0 has a different set of permission that it enforces.
We introduce keystore2_key so that we can set up policy for both
Keystore 1.0 and Keystore 2.0 for a gradual transition from one to
the other.

Bug: 158500146
Test: None
Change-Id: I3dcab06d73d242d63d21883659c304dfab8bf74f
Merged-In: I3dcab06d73d242d63d21883659c304dfab8bf74f
diff --git a/private/security_classes b/private/security_classes
index 04ed814..3e9bff0 100644
--- a/private/security_classes
+++ b/private/security_classes
@@ -153,8 +153,14 @@
 # hardware service manager      # userspace
 class hwservice_manager
 
-# Keystore Key
+# Legacy Keystore key permissions
 class keystore_key              # userspace
 
+# Keystore 2.0 permissions
+class keystore2                 # userspace
+
+# Keystore 2.0 key permissions
+class keystore2_key             # userspace
+
 class drmservice                # userspace
 # FLASK