Merge tag 'firmware-20260218-pull-request' of https://gitlab.com/kraxel/qemu into...

Merge tag 'firmware-20260218-pull-request' of https://gitlab.com/kraxel/qemu into staging

- firmware json spec update
- igvm update

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# gpg:                using RSA key A0328CFFB93A17A79901FE7D4CB6D8EED3E87138
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# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>" [full]
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>" [full]
# Primary key fingerprint: A032 8CFF B93A 17A7 9901  FE7D 4CB6 D8EE D3E8 7138

* tag 'firmware-20260218-pull-request' of https://gitlab.com/kraxel/qemu:
  docs/interop/firmware: Add 'uefi-vars' member for FirmwareMappingMemory
  igvm: Add NULL checks for igvm_get_buffer()

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>