By Jude Summerfield FROM TOTTENHAM HOTSPUR STADIUM – Tottenham summoned a dramatic second-half turnaround capped by Brennan Johnson’s late winner to steal victory over Brighton in the Premier League on Saturday afternoon. The Seagulls went ahead in north London as Pascal Gross converted from the penalty spot after Danny Welbeck was brought down, but Spurs railled and dragged themselves level when Pape Matar Sarr finished on the rebound. A winner looked unlikely to emerge but Son Heung-min’s late cross was powered into the roof of the net by Johnson in the 97th minute to earn the hosts a moment…