irqchip fixes for 6.4, take #1

- MIPS GIC fixes for issues that could result in either
  loss of state in the interrupt controller, or a deadlock

- Workaround for Mediatek Chromebooks that only save/restore
  partial state when turning the GIC redistributors off,
  resulting if fireworks if Linux uses interrupt priorities
  for pseudo-NMIs

- Fix the MBIGEN error handling on init

- Mark meson-gpio OF data structures as __maybe_unused,
  avoiding compilation warnings on non-OF setups
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