ABBA are wanted by Grammys bosses to reunite for a performance at the upcoming ceremony. The Swedish pop icons – comprising Agnetha Faltskog, Bjorn Ulvaeus, Benny Andersson and Anni-Frid Lyngstad – haven’t performed together since 1982. The ‘Dancing Queen’ hitmakers are nominated for the Record of the Year Grammy for their comeback single, ‘I Still Have Faith In You’, and organisers are hoping to persuade the band to perform at Las Vegas’ MGM Grand Garden Arena on April 3 – but it’s proving challenging. A source told The Sun newspaper’s Bizarre column: “The team pulling the Grammys together ha…