Remove old binder interface entry for keystore2

Now that keystore2 is a VNDK stable interface, we need to remove the
legacy unqualified interface from the keystore service context.

Test: Compile, boot, and ensure no SELinux violations for keystore2 service
Change-Id: I770c08eae9690b0dc0e2bae86c9ef72f9540d2f4
diff --git a/private/service_contexts b/private/service_contexts
index 125b05d..c86edd5 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -41,7 +41,6 @@
 android.security.remoteprovisioning       u:object_r:remoteprovisioning_service:s0
 android.security.vpnprofilestore          u:object_r:vpnprofilestore_service:s0
 android.service.gatekeeper.IGateKeeperService    u:object_r:gatekeeper_service:s0
-android.system.keystore2                  u:object_r:keystore_service:s0
 app_binding                               u:object_r:app_binding_service:s0
 app_hibernation                           u:object_r:app_hibernation_service:s0
 app_integrity                             u:object_r:app_integrity_service:s0