The self-driving startup Aurora Innovation Inc. has raised $530 million from a group of investors led by Sequoia Capital, Silicon Valley’s storied venture capital firm, that includes financial backing from Amazon.com Inc. and T. Rowe Price Group Inc. This second round of funding for Aurora values the company at more than $2.5 billion. Aurora’s three co-founders are legendary within the tight community of roboticists and engineers who are leading the charge to make self-driving cars a reality.