irqchip/riscv-intc: Allow large non-standard interrupt number

Currently, the implementation of the RISC-V INTC driver uses the
interrupt cause as the hardware interrupt number, with a maximum of
64 interrupts. However, the platform can expand the interrupt number
further for custom local interrupts.

To fully utilize the available local interrupt sources, switch
to using irq_domain_create_tree() that creates the radix tree
map, add global variables (riscv_intc_nr_irqs, riscv_intc_custom_base
and riscv_intc_custom_nr_irqs) to determine the valid range of local
interrupt number (hwirq).

Signed-off-by: Yu Chien Peter Lin <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Randolph <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Reviewed-by: Atish Patra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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