ARM: dts: imx6qdl-tx6: add ENET_OUT clock to fec node

ENET_OUT is used as reference clock for the ethernet PHY on the Ka-Ro
TX6 modules. Specify this clock in DTB to let it be managed correctly
by the driver.
Signed-off-by: NLothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-tx6.dtsi

@@ -227,6 +227,11 @@
 &fec {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_enet>;
+	clocks = <&clks IMX6QDL_CLK_ENET>,
+		 <&clks IMX6QDL_CLK_ENET>,
+		 <&clks IMX6QDL_CLK_ENET_REF>,
+		 <&clks IMX6QDL_CLK_ENET_REF>;
+	clock-names = "ipg", "ahb", "ptp", "enet_out";
 	phy-mode = "rmii";
 	phy-reset-gpios = <&gpio7 6 GPIO_ACTIVE_HIGH>;
 	phy-supply = <&reg_3v3_etn>;