arm/arm64: dts: Add MV88E6393X to CN9130-CRB device tree

The CN9130-CRB boards have a MV88E6393X switch connected to eth0. Add
the necessary dts nodes and properties for this.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>