uboot-imx

tools: mxsboot: Staticize functions

Make remaining non-static functions static and the same for vars.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>