Adds the abillity to use a custom u-boot repo and a custom branch.
Change-Id: I15df8a41d3d94ca0559abc964792035651b3d8b2
Signed-off-by: Maximilian Brune <maximilian.brune@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/89616
Reviewed-by: Marc Jones <marc@marcjonesconsulting.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
4b50bc9e5f