The imx_hab_is_enabled function makes sure SPL and U-Boot only blocks the boot process when HAB is actually enabled. Currently only the SEC_CONFIG fuse is checked for this, as this is the fuse that closes the board for HAB. The Field return fuse however is used to permanently disable HAB. This fuse is not taken into account.
Take the FIELD_RETURN fuse into account as well when deciding whether HAB is enabled. v2: - Split up into two commits
