Merge 360aced7de into f28e16d14e

UKIs can be used to bundle firmware blobs 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.

Add support to introduce a .efifwauto 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. Subsequent patches will add full support
for this selection mechanism.

ukify tool has been also changed to support addition of a firmware image
in UKI. For example:

ukify.py build \
        --stub ./build/src/boot/efi/linuxx64.efi.stub \
        --linux bzImage \
        --cmdline='blah blah debug' \
        --firmware ~/OVMF.fd \
        --output=root/efi/boot/bootx64.efi

Co-authored-by: harald.hoyer@gmail.com

src/measure/measure.c

@@ -109,7 +109,6 @@ static int help(int argc, char *argv[], void *userdata) {
                "     --ucode=PATH        Path to microcode image file           %7$s .ucode\n"
                "     --splash=PATH       Path to splash bitmap file             %7$s .splash\n"
                "     --dtb=PATH          Path to DeviceTree file                %7$s .dtb\n"
-               "     --dtbauto=PATH      Path to DeviceTree file for auto selection %7$s .dtbauto\n"
                "     --uname=PATH        Path to 'uname -r' file                %7$s .uname\n"
                "     --sbat=PATH         Path to SBAT file                      %7$s .sbat\n"
                "     --pcrpkey=PATH      Path to public key for PCR signatures  %7$s .pcrpkey\n"