irqchip/renesas-rzg2l: Enhance driver to support interrupt affinity setting

Add support to set the affinity of the IRQC interrupt by implementing
the irq_set_affinity callback via the parent interrupt chip.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20231011195324.66807-1-prabhakar.mahadev-lad.rj@bp.renesas.com