PARIS (Reuters) -Sodexo has entered talks with buyout firm CVCon a deal about its restaurant check unit, French business daily Les Echos reported on Monday, citing sources close to the talks. Both CVC and Sodexo declined to comment. Sodexo is prepared to sell 20% to 30% of the unit, which could be valued at as much as 4 billion euros ($4.3 billion) to CVC, the report said. According to the report, Sodexo had approached other private equity firms including Bain Capital and Silver Lake, but these had considered the price too high and walked away from the deal. Analysts at Morgan Stanley and Alph…