net: dsa: microchip: ksz8563: Add number of port irq

KSZ8563 have three port interrupts: PTP, PHY and ACL. Add
port_nirq as 3 for KSZ8563 inside ksz_chip_data.

Signed-off-by: Rakesh Sankaranarayanan <rakesh.sankaranarayanan@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>