83bf58f39d
UKIs can be used to bundle uefi firmwares that can be measured and used on a confidential computing environment. There can be more than one firmware blob bundle, each one for a specific platform. Also firmware images can themselves be containers like IGVM files that can in turn bundle the actual firmware blob. This change is specifically for uefi firmwares, not IGVM container files. This change adds support to introduce a .efifw section in UKI that can be used for firmware blobs/images. There can be multiple such sections and each section can contain a single firmware image. The matching .hwids entry for a specific platform can be used to select the most appropriate firmware blob. ukify tool has been also changed to support addition of a firmware image in UKI. Since firmware gets measured automatically, we do not need to measure it separately as a part of the UKI.
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