The existing loops were iterating through all RAM_CONFIGS, but
they must only iterate over those that match the RAM size on the
platform's UBOOT_CONFIG.
This commit adds a Python class 'boot-artifacts' to get the list of matching
combinations of RAM_CONFIGS and UBOOT_CONFIG so that the iteration
is easier to do than nesting loops inside one another.
Signed-off-by: Hector Palacios <hector.palacios@digi.com>
https://jira.digi.com/browse/DEL-6641