uboot-imx

tools: socfpga: Stop using global struct socfpga_image

The structure is passed around correctly, create local instances
where necessary and zap the global struct socfpga_image instance.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Chin Liang See <chin.liang.see@intel.com>