arm64: dts: ti: k3-j721s2-mcu-wakeup: Fix the interrupt-parent for wkup_gpioX instances

The interrupt-parent for wkup_gpioX instances are wrongly assigned as
main_gpio_intr instead of wkup_gpio_intr. Fix it.

Fixes: b8545f9d ("arm64: dts: ti: Add initial support for J721S2 SoC")
Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Kishon Vijay Abraham I <kishon@ti.com>
Link: https://lore.kernel.org/r/20220203132647.11314-1-a-govindraju@ti.com