Add nl vendor id and attributes for peer stats cache flush.
Peer rate statistics is per-peer cached data in host driver,
these statistics needs to be flushed to user space on
synchronous/asynchronous events.
This command is used to flush per-peer cached statistics
to application
CRs-Fixed: 2397918
Change-Id: Ie75e11e5949e754dd4779f88f1f6aeb984873f32