A smartphone with a displayed Arm Ltd logo is placed on a computer motherboard in this illustration taken March 6, 2023. REUTERS/Dado Ruvic/Illustration/File Photo Acquire Licensing Rights Aug 22 (Reuters) - The upcoming listing of semiconductor technology firm Arm Holdings Ltd is supposed to be strong medicine for what has been ailing the U.S. IPO market, as well as provide a shot in the arm for Arm owner Softbank Group Corp (9984.T). There is one complication, however. Almost a quarter of Arm's revenue comes from an entity it does not control but nonetheless relies on to access China's massive smartphone...