Merge tag 'uefi-20250321-pull-request' of https://gitlab.com/kraxel/qemu into staging

Merge tag 'uefi-20250321-pull-request' of https://gitlab.com/kraxel/qemu into staging

hw/uefi-vars: bug fixes
hw/uefi-vars: support riscv and loongarch
docs: update firmware.json spec

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

* tag 'uefi-20250321-pull-request' of https://gitlab.com/kraxel/qemu:
  docs/firmware: add feature flag for host uefi variable store
  hw/uefi-vars-sysbus: allow for loongarch virt
  hw/uefi-vars-sysbus: allow for riscv virt
  hw/uefi: fix error handling in uefi_vars_json_load
  hw/uefi: fix error handling in uefi_vars_json_save
  hw/uefi: flush variable store to disk in post load

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