By Foo Yun Chee BRUSSELS (Reuters) – U.S. business software maker Oracle Corp is set to gain unconditional EU antitrust clearance for its $28.3 billion acquisition of U.S. healthcare IT company Cerner Corp, three people familiar with the matter said on Tuesday. Oracle announced the deal, its biggest ever, in December last year. It will give it access to a trove of data and could attract more healthcare clients to its cloud platform. Cerner’s data can help Oracle train and improve the software maker’s artificial intelligence-based cloud services. The company, whose software traditionally ran in…