ARM: dts: renesas: Add compatible properties to LAN8710A Ethernet PHYs

Add compatible values to Ethernet PHY subnodes representing SMSC
LAN8710A PHYs on RZ/A1 and R-Mobile A1 boards.  This allows software to
identify the PHY model at any time, regardless of the state of the PHY
reset line.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/247dc2074dae149af07b6d014985ad30eb362eda.1631174218.git.geert+renesas@glider.be

arch/arm/boot/dts/r7s72100-gr-peach.dts

@@ -129,6 +129,8 @@
 	phy-handle = <&phy0>;
 
 	phy0: ethernet-phy@0 {
+		compatible = "ethernet-phy-id0007.c0f0",
+			     "ethernet-phy-ieee802.3-c22";
 		reg = <0>;
 
 		reset-gpios = <&port4 2 GPIO_ACTIVE_LOW>;

arch/arm/boot/dts/r8a7740-armadillo800eva.dts

@@ -170,6 +170,8 @@
 	status = "okay";
 
 	phy0: ethernet-phy@0 {
+		compatible = "ethernet-phy-id0007.c0f1",
+			     "ethernet-phy-ieee802.3-c22";
 		reg = <0>;
 	};
 };