Sean ‘Diddy’ Combs has spoken out from prison during a birthday call with his children on Monday. The disgraced rapper, who is currently incarcerated at the Metropolitan Detention Center in Brooklyn following his September arrest, was heard telling his kids he’d “see them soon” as he awaits an upcoming trial date, RadarOnline.com can reveal. An Instagram video uploaded on Monday showed Diddy’s 2-year-old daughter Love, who he shares with Dana Tran, joined by siblings D’Lila and Jessie, 17, Quincy, 33, Christian, 27, and Justin, 30, as they sang their dad happy birthday in front of a cake. Comb…