Seperate original U-Boot from patch.

Base version is git://git.denx.de/u-boot.git, tag v2013.07
Separated patch is
https://raw.github.com/eewiki/u-boot-patches/master/v2013.07/0001-wandboard-uEnv.txt-bootz-n-fixes.patch

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>