By David Jeans and Joey Roulette NEW YORK, Jan 30 (Reuters) - SpaceX (SPAX.PVT) revised its Starlink privacy policy to allow the use of customer data for AI training, a shift that ​could bolster Elon Musk's AI ambitions. Ahead of a blockbuster IPO planned for later this year, ‌SpaceX is in talks to merge with Musk’s AI company, xAI (XAAI.PVT), a deal first reported by Reuters on Thursday. SpaceX, already the ‌world’s most valuable private company, could reach a value of more than $1 trillion...