Merge tag 'firmware-20250304-pull-request' of https://gitlab.com/kraxel/qemu into...

Merge tag 'firmware-20250304-pull-request' of https://gitlab.com/kraxel/qemu into staging

- add uefi variable store support

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* tag 'firmware-20250304-pull-request' of https://gitlab.com/kraxel/qemu: (24 commits)
  docs: add uefi variable service documentation
  hw/uefi: add MAINTAINERS entry
  hw/uefi-vars-sysbus: allow for pc and q35
  hw/uefi-vars-sysbus: allow for arm virt
  hw/uefi-vars-sysbus: add x64 variant
  hw/uefi-vars-sysbus: qemu platform bus support
  hw/uefi: add uefi-vars-sysbus device
  hw/uefi: add to meson
  hw/uefi: add UEFI_VARS to Kconfig
  hw/uefi: add trace-events
  hw/uefi: add var-service-json.c + qapi for NV vars.
  hw/uefi: add var-service-siglist.c
  hw/uefi: add var-service-pkcs7-stub.c
  hw/uefi: add var-service-pkcs7.c
  hw/uefi: add var-service-core.c
  hw/uefi: add var-service-policy.c
  hw/uefi: add var-service-auth.c
  hw/uefi: add var-service-vars.c
  hw/uefi: add var-service-utils.c
  hw/uefi: add var-service-guid.c
  ...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>