HONG KONG (Reuters) - Sequoia Capital, an early investor in global tech behemoths like Google Inc and Apple Inc, aims to raise up to $8 billion in its largest-ever fundraising and has set sights on Chinese investors, people familiar with the plan told Reuters. More cash in the bag would help the Silicon Valley venture capital giant diversify its focus from early-and growth-stage investments to pre-IPO funding rounds, at a time when startup valuations are spiking partly due to money pouring in from SoftBank Group Corp’s $93 billion Vision Fund. “There is so much money now (in the tech sector).