arm64: dts: marvell: add TX interrupts for PPv2.2

This commit updates the Marvell Armada 7K/8K Device Tree to describe
the TX interrupts of the Ethernet controllers, in both the master and
slave CP110s.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>