arm64: dts: qcom: sa8775p-ride: index the first SGMII PHY

We'll be adding a second SGMII PHY on the same MDIO bus, so let's index
the first one for better readability.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Andrew Halaney <ahalaney@redhat.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Tested-by: Andrew Halaney <ahalaney@redhat.com>
Link: https://lore.kernel.org/r/20230810080909.6259-6-brgl@bgdev.plSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/sa8775p-ride.dts

@@ -263,7 +263,7 @@ vreg_l8e: ldo8 {
 
 &ethernet0 {
 	phy-mode = "sgmii";
-	phy-handle = <&sgmii_phy>;
+	phy-handle = <&sgmii_phy0>;
 
 	pinctrl-0 = <&ethernet0_default>;
 	pinctrl-names = "default";
@@ -279,7 +279,7 @@ mdio {
 		#address-cells = <1>;
 		#size-cells = <0>;
 
-		sgmii_phy: phy@8 {
+		sgmii_phy0: phy@8 {
 			compatible = "ethernet-phy-id0141.0dd4";
 			reg = <0x8>;
 			device_type = "ethernet-phy";