buildroot

uboot-tools: bump to version 2016.05

Bump to version 2016.05 and also remove patch
003-tools-env-bug-config-structs-must-be-defined-in-tool.patch, as it is
upstreamed now.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>