[U-Boot] [ANN] v2016.05-rc3

Hey all,

I know I did v2016.05-rc2 just last week, but that's because I was off schedule. We are two weeks out from scheduled release, so he's -rc3. Please test this everywhere you can. The diffstat here is large due to moving things from config.h to Kconfig but the binary delta is not. At this point forward, I expect things that come in to be bug fixes of a fairly important nature. Oh, and I'm going to re-generate the defconfigs and let people know about the surprises that spring up. Correcting those is also fine. Thanks all!