[U-Boot] [ANN] U-Boot v2017.03-rc2 released

Hey all,

It's release day and v2017.03-rc2 is out. I think my patchwork queue is looking good currently but I'm open to being told there's important stuff outstanding. I'm probably going to grab some Kconfig things and perhaps other cleanups I can mechanically confirm are correct. Things are on track for -rc3 on the 27th.

Thanks all!