ath79: enable SGMII workaround for affected boards

These boards suffer from a sudden inability to establish a link on the
SGMII. Enable the workaround to fix the link when it dies.

Signed-off-by: David Bauer <mail@david-bauer.net>

target/linux/ath79/dts/qca9556_avm_fritz-repeater.dtsi

@@ -78,6 +78,8 @@
 	phy-handle = <&phy0>;
 	pll-data = <0x3000000 0x101 0x1313>;
 
+	qca955x-sgmii-fixup;
+
 	gmac-config {
 		device = <&gmac>;
 		ge0-sgmii = <0>;
@@ -89,5 +91,6 @@
 
 	phy0: ethernet-phy@0 {
 		reg = <0>;
+		at803x-override-sgmii-link-check;
 	};
 };

target/linux/ath79/dts/qca9558_devolo_dvl1xxx.dtsi

@@ -132,6 +132,7 @@
 &mdio1 {
 	phy1: ethernet-phy@1 {
 		reg = <1>;
+		at803x-override-sgmii-link-check;
 	};
 };
 
@@ -141,6 +142,8 @@
 
 	phy-handle = <&phy1>;
 	pll-data = <0x03000101 0x00000101 0x00001313>;
+
+	qca955x-sgmii-fixup;
 };
 
 &wmac {

target/linux/ath79/dts/qca9558_ocedo_ursus.dts

@@ -117,6 +117,7 @@
 
 	phy2: ethernet-phy@2 {
 		reg = <2>;
+		at803x-override-sgmii-link-check;
 	};
 };
 
@@ -144,4 +145,5 @@
 	mtd-mac-address = <&art 0x12>;
 	phy-handle = <&phy2>;
 	pll-data = <0x3000101 0x101 0x1313>;
+	qca955x-sgmii-fixup;
 };