Nikkei hits 3-wk high on US data, Renesas jumps on Apple report

* U.S. data lifts foreign investors' risk appetite - traders * Renesas at 3-yr high, Apple reportedly in talks to buy unit stake * Kyushu Elec dives, said to be seeking capital injection By Ayai Tomisawa TOKYO, April 2 (Reuters) - Japan's Nikkei share average bounced back to a three-week high on Wednesday, tracking gains on Wall Street, while Renesas Electronics Corp jumped on a report that Apple is in talks to buy its stake in a chip design unit. Renesas soared as much as 1