irqchip/irq-realtek-rtl: Add multicore supportrefs/merge-window/136e9300e5177580086bece9aaf1dabc9e267b44

The Realtek interrupt driver currently supports only single core
systems. So the higher end devices like RTL839x and RTL930x with
dual VPEs must be driven with NR_CPU=1. Enhance the driver to
support multicore (dual VPE) systems. For this:

  - Extend the register map for multiple cores
  - Search for multiple CPU cores in the devicetree
  - Improve the register helpers to support multiple cores
  - Add an affinity setter
  - Enhance the IRQ handler for multiple cores

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260604182506.1113440-3-markus.stockhausen@gmx.de

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