You can buy and hold these two Buffett stocks for a lifetime.Warren Buffett isn't necessarily known for his growth investing. But he has identified several stocks that, for decades at a time, turned out to be growth machines. There are two stocks in Berkshire Hathaway's portfolio right now that every investor should consider. They've been monster growth stocks in the past. And if you use the correct investment strategy, they can still produce immense long-term gains for your portfolio.These two stocks have ...