[coreboot-gerrit] Change in coreboot[master]: {drivers,soc/intel/braswell}: Implement C_ENVIRONMENT_BOOTBLOCK support

[Angel Pons (Code Review)]

Angel Pons has created a revert of this change. ( https://review.coreboot.org/c/coreboot/+/29662 )

Change subject: {drivers,soc/intel/braswell}: Implement C_ENVIRONMENT_BOOTBLOCK support
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