arm64: dts: marvell: armada-cp110: describe more PPv2 interrupts

This patch describes 3 additional interrupts per PPv2 port. Those
interrupts will be used later in future versions of the Marvell PPv2
driver, and now the device tree description matches the hardware
capabilities.

Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>