[U-Boot] [ANN] U-Boot v2017.07-rc3 released

Hey all,

It's release day and v2017.07-rc3 is out. Things look good. I was hoping to have a few things pulled in today but that just didn't work out. So, I expect to be bringing back PowerPC 8xx support in the next few days. No, it's not perfect. But it's better than it was before it was removed and the new maintainer has committed to making things better. And, I'm a sucker for incremental improvement over time.

I expect us to release v2017.07 on schedule on the 10th of July.

Thanks all!