Todd Spangler NY Digital EditorDiscovery has a new ally in the streaming wars in SiriusXM: The companies have formed a new marketing partnership aimed at driving up subscribers to Discovery Plus streaming service.Under the pact, new and existing subscribers to SiriusXM’s Platinum VIP plan — priced at $34.99 per month — will be eligible to activate a complimentary 12-month subscription to Discovery Plus.SiriusXM also will launch special promotions that give eligible new subscribers to its