uboot-imx

tools: Update openrisc toolchain information

Since commit 87da2690ab81b5f29f83dc85c55f933e6ef414bc
"openrisc: updating build tools naming convention", openrisc
kernel.org toolchain is out of date and cannot build U-Boot.
Update buildman and moveconfig tools to refer to the new one.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>