Merge tag 'qemu-macppc-20230206' of https://github.com/mcayland/qemu into staging

Merge tag 'qemu-macppc-20230206' of https://github.com/mcayland/qemu into staging

qemu-macppc patches for 8.0

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* tag 'qemu-macppc-20230206' of https://github.com/mcayland/qemu:
  mac_oldworld: Allow specifying nvram backing store
  mac_nvram: Add block backend to persist NVRAM contents
  hw/misc/macio: Return bool from functions taking errp
  hw/misc/macio: Remove some single use local variables
  hw/misc/macio: Rename sysbus_dev to sbd for consistency and brevity
  hw/misc/macio: Avoid some QOM casts
  mac_{old,new}world: Use local variable instead of qdev_get_machine()
  input/adb: Only include header where needed

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