arm64: dts: marvell: Add 7k/8k PHYs in USB3 nodes

Fill-in the missing USB3 phys/phy-names DT properties of Armada 7k/8k
based boards. Only update nodes actually enabling USB3 in the default
(mainline) configuration. A few USB nodes are enabled but there is
only USB2 working on them.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>