ath79: qca955x: assert mdio/gmac reset together

This allows resetting gmac registers during initialization.
Also add compatible string for qca955x mdio to enable more mdio
clock dividers.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>

target/linux/ath79/dts/qca9557.dtsi

@@ -289,12 +289,11 @@
 };
 
 &mdio0 {
-	resets = <&rst 22>;
-	reset-names = "mdio";
+	compatible = "qca,ar9340-mdio";
 };
 
 &eth0 {
-	compatible = "qca,qca9550-eth", "syscon", "simple-mfd";
+	compatible = "qca,qca9550-eth", "syscon";
 
 	pll-reg = <0 0x28 0>;
 	pll-handle = <&pll>;
@@ -302,17 +301,16 @@
 	pll-data = <0x16000000 0x00000101 0x00001616>;
 	phy-mode = "rgmii";
 
-	resets = <&rst 9>;
-	reset-names = "mac";
+	resets = <&rst 9>, <&rst 22>;
+	reset-names = "mac", "mdio";
 };
 
 &mdio1 {
-	resets = <&rst 23>;
-	reset-names = "mdio";
+	compatible = "qca,ar9340-mdio";
 };
 
 &eth1 {
-	compatible = "qca,qca9550-eth", "syscon", "simple-mfd";
+	compatible = "qca,qca9550-eth", "syscon";
 
 	pll-reg = <0 0x48 0>;
 	pll-handle = <&pll>;
@@ -320,6 +318,6 @@
 	pll-data = <0x16000000 0x00000101 0x00001616>;
 	phy-mode = "sgmii";
 
-	resets = <&rst 13>;
-	reset-names = "mac";
+	resets = <&rst 13>, <&rst 23>;
+	reset-names = "mac", "mdio";
 };