NEW YORK — Nvidia has won Beijing's approval to sell its second-most powerful artificial intelligence chips to China and is also preparing a version of the Groq AI chip that can be sold to the Chinese market, sources familiar with the matter said. The long-awaited regulatory approval paves the way for the US chipmaker to resume sales of the H200 chips, which have emerged as a major flashpoint in US-China relations, in a market that once generated 13 percent of Nvidia's total revenue.Despite strong demand from Chinese firms and US approval for exports, Beijing's hesitation to allow imports has been…