ARM: dts: turris-omnia: update ethernet-phy node and handle name

Use property name `phy-handle` instead of the deprecated `phy` to
connect eth2 to the PHY.
Rename the node from "phy@1" to "ethernet-phy@1", since "phy@1" is
incorrect according to device-tree bindings documentation.
Also remove the "ethernet-phy-id0141.0DD1" compatible string, it is not
needed. Kernel can read the PHY identifier itself.

Signed-off-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Uwe Kleine-König <uwe@kleine-koenig.org>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Gregory CLEMENT <gregory.clement@bootlin.com>
Cc: Andreas Färber <afaerber@suse.de>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>