A sign of Baidu is pictured at the company's headquarters in Beijing, China March 16, 2023. REUTERS/Tingshu Wang/File Photo Purchase Licensing Rights, opens new tabJan 2 (Reuters) - Chinese internet search giant Baidu (9888.HK), opens new tab said on Friday its AI chip unit Kunlunxin has confidentially filed a listing application with the Hong Kong stock exchange on January 1, paving the way for a spin-off and separate listing.Reuters had earlier reported that Kunlunxin was planning for a Hong K...