arm: dts: mt7623: add subsystem clock controller device nodes

Add MT7623 subsystem clock controllers for hifsys and ethsys.
Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm/boot/dts/mt7623.dtsi

@@ -190,4 +190,20 @@ uart3: serial@11005000 {
 		clock-names = "baud", "bus";
 		status = "disabled";
 	};
+
+	hifsys: syscon@1a000000 {
+		compatible = "mediatek,mt7623-hifsys",
+			     "mediatek,mt2701-hifsys",
+			     "syscon";
+		reg = <0 0x1a000000 0 0x1000>;
+		#clock-cells = <1>;
+	};
+
+	ethsys: syscon@1b000000 {
+		compatible = "mediatek,mt7623-ethsys",
+			     "mediatek,mt2701-ethsys",
+			     "syscon";
+		reg = <0 0x1b000000 0 0x1000>;
+		#clock-cells = <1>;
+	};
 };