net: ethernet: ti: icssg_prueth: fix irqs type

The K3 INTA driver, which is source TX/RX IRQs for ICSSG network, defines
IRQs triggering type as EDGE by default, but triggering type for CPSW NUSS
TX/RX IRQs has to be LEVEL as the EDGE triggering type may cause
unnecessary IRQs triggering and NAPI scheduling for empty queues.

Fix it by explicitly specifying ICSSG TX/RX IRQ type as IRQF_TRIGGER_HIGH.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>