ARM: dts: armada-375: Update network description to match schema

Update the PP2 ethernet ports subnodes' names to match
schema enforced by the marvell,pp2.yaml contents.

Add new required properties ('reg') which contains information
about the port ID, keeping 'port-id' ones for backward
compatibility.
Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/arm/boot/dts/armada-375.dtsi

@@ -178,6 +178,8 @@ mdio: mdio@c0054 {
 
 			/* Network controller */
 			ethernet: ethernet@f0000 {
+				#address-cells = <1>;
+				#size-cells = <0>;
 				compatible = "marvell,armada-375-pp2";
 				reg = <0xf0000 0xa000>, /* Packet Processor regs */
 				      <0xc0000 0x3060>, /* LMS regs */
@@ -187,15 +189,17 @@ ethernet: ethernet@f0000 {
 				clock-names = "pp_clk", "gop_clk";
 				status = "disabled";
 
-				eth0: eth0 {
+				eth0: ethernet-port@0 {
 					interrupts = <GIC_SPI 37 IRQ_TYPE_LEVEL_HIGH>;
-					port-id = <0>;
+					reg = <0>;
+					port-id = <0>; /* For backward compatibility. */
 					status = "disabled";
 				};
 
-				eth1: eth1 {
+				eth1: ethernet-port@1 {
 					interrupts = <GIC_SPI 41 IRQ_TYPE_LEVEL_HIGH>;
-					port-id = <1>;
+					reg = <1>;
+					port-id = <1>; /* For backward compatibility. */
 					status = "disabled";
 				};
 			};