[U-Boot] [ANN] U-Boot v2017.07-rc2 released

Hey all,

It's release day and v2017.07-rc2 is out. I'm mostly happy with the size of the changes here and I did remember to sync the defconfigs prior to tagging.

If anyone has critical fixes I've missed or some Kconfig migrations (that I can prove out as correct), please speak up.

Things look on track for -rc3 on July 3rd and release on July 10th. Thanks all!