irqchip/renesas-rzg2l: Reorder function calls in rzg2l_irqc_irq_disable()

The order of function calls in the disable operation should be the reverse
of that in the enable operation. Thus, reorder the function calls to first
disable the parent IRQ chip before disabling the TINT IRQ.

Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com> # on RZ/G3S
Link: https://lore.kernel.org/r/20240606194813.676823-1-prabhakar.mahadev-lad.rj@bp.renesas.com