irqchip updates for 6.3

- New and improved irqdomain locking, closing a number of races that
  became apparent now that we are able to probe drivers in parallel

- A bunch of OF node refcounting bugs have been fixed

- We now have a new IPI mux, lifted from the Apple AIC code and
  made common. It is expected that riscv will eventually benefit
  from it

- Two small fixes for the Broadcom L2 drivers

- Various cleanups and minor bug fixes
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