U-Boot's SPL framework already has an API for loading U-Boot via BootROM. Implement the function board_return_to_bootrom() for mvebu SPL code. Signed-off-by: Pali Rohár <pali@kernel.org> Reviewed-by: Marek Behún <marek.behun@nic.cz> Reviewed-by: Stefan Roese <sr@denx.de> Reviewed-by: Chris Packham <judge.packham@gmail.com> Tested-by: Chris Packham <judge.packham@gmail.com>