arm64: dts: visconti: Update the clock providers for ethernet device

Remove fixed clock and source common clock for ethernet device.

Signed-off-by: Nobuhiro Iwamatsu <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]/

arch/arm64/boot/dts/toshiba/tmpv7708-rm-mbrc.dts

···
 	status = "okay";
 	phy-handle = <&phy0>;
 	phy-mode = "rgmii-id";
-	clocks = <&clk300mhz>, <&clk125mhz>;
-	clock-names = "stmmaceth", "phy_ref_clk";
 
 	mdio0 {
 		#address-cells = <1>;

arch/arm64/boot/dts/toshiba/tmpv7708-visrobo-vrb.dts

···
 	status = "okay";
 	phy-handle = <&phy0>;
 	phy-mode = "rgmii-id";
-	clocks = <&clk300mhz>, <&clk125mhz>;
-	clock-names = "stmmaceth", "phy_ref_clk";
 
 	mdio0 {
 		#address-cells = <1>;

arch/arm64/boot/dts/toshiba/tmpv7708.dtsi

···
 		clock-output-names = "clk25mhz";
 	};
 
-	clk125mhz: clk125mhz {
-		compatible = "fixed-clock";
-		clock-frequency = <125000000>;
-		#clock-cells = <0>;
-		clock-output-names = "clk125mhz";
-	};
-
-	clk300mhz: clk300mhz {
-		compatible = "fixed-clock";
-		clock-frequency = <300000000>;
-		#clock-cells = <0>;
-		clock-output-names = "clk300mhz";
-	};
-
 	clk600mhz: clk600mhz {
 		compatible = "fixed-clock";
 		#clock-cells = <0>;
···
 			snps,txpbl = <4>;
 			snps,rxpbl = <4>;
 			snps,tso;
+			clocks = <&pismu TMPV770X_CLK_PIETHER_BUS>, <&pismu TMPV770X_CLK_PIETHER_125M>;
+			clock-names = "stmmaceth", "phy_ref_clk";
 			status = "disabled";
 		};