irqchip fixes for 6.6, take #2

- DT binding updates for Renesas r8a779f0 and rzg2l

- Let GICv3 honor the "dma-non-coherent" attribute for systems that
  rely on SW guessing what the HW supports

- Fix the RISC-V INTC probing by marking all devices as initialised
  at once

- Properly translate interrupt numbers from DT on stm32-exti

- Use irq_data_get_irq_chip_data() in the rzg2l driver instead of
  blindly dereferencing the irq_data structure

- Add a MAINTAINERS entry for the various ARM GIC irqchip drivers

- Remove myself as the top-level irqchip/irqdomain maintainer
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