iwlwifi: mvm: Do not set RTS/CTS protection for P2P Device MAC

As this is not needed and might cause interoperability issues
during pairing with devices that would not reply to RTS frames.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>