SINGAPORE, April 16 (Reuters) - Nvidia (NVDA.O), opens new tab did not alert some of its top customers ahead of tighter U.S. export regulations affecting its AI chip tailored for China, according to two individuals familiar with the situation. The chipmaking giant revealed on Tuesday that it had been notified by U.S. authorities on April 9 that its H20 chip would now need a government-issued license to be shipped to China. This latest restriction is part of Washington’s ongoing attempts to curb