Merge tag 'uefi-20250812-pull-request' of https://gitlab.com/kraxel/qemu into staging

Merge tag 'uefi-20250812-pull-request' of https://gitlab.com/kraxel/qemu into staging

hw/uefi: last-minute bug fixes for the uefi variable store [for 10.1]

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* tag 'uefi-20250812-pull-request' of https://gitlab.com/kraxel/qemu:
  hw/uefi: open json file in binary mode
  hw/uefi: check access for first variable
  hw/uefi: return success for notifications
  hw/uefi: clear uefi-vars buffer in uefi_vars_write callback

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