ARM: dts: imx6ull-colibri: Add sleep mode to fec

Do not change the clock as the power for this phy is switched
with that clock.
Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6ull-colibri.dtsi

@@ -62,8 +62,9 @@ &ecspi1 {
 };
 
 &fec2 {
-	pinctrl-names = "default";
+	pinctrl-names = "default", "sleep";
 	pinctrl-0 = <&pinctrl_enet2>;
+	pinctrl-1 = <&pinctrl_enet2_sleep>;
 	phy-mode = "rmii";
 	phy-handle = <&ethphy1>;
 	status = "okay";
@@ -220,6 +221,21 @@ MX6UL_PAD_ENET2_TX_EN__ENET2_TX_EN	0x1b0b0
 		>;
 	};
 
+	pinctrl_enet2_sleep: enet2sleepgrp {
+		fsl,pins = <
+			MX6UL_PAD_GPIO1_IO06__GPIO1_IO06	0x0
+			MX6UL_PAD_GPIO1_IO07__GPIO1_IO07	0x0
+			MX6UL_PAD_ENET2_RX_DATA0__GPIO2_IO08	0x0
+			MX6UL_PAD_ENET2_RX_DATA1__GPIO2_IO09	0x0
+			MX6UL_PAD_ENET2_RX_EN__GPIO2_IO10	0x0
+			MX6UL_PAD_ENET2_RX_ER__GPIO2_IO15	0x0
+			MX6UL_PAD_ENET2_TX_CLK__ENET2_REF_CLK2	0x4001b031
+			MX6UL_PAD_ENET2_TX_DATA0__GPIO2_IO11	0x0
+			MX6UL_PAD_ENET2_TX_DATA1__GPIO2_IO12	0x0
+			MX6UL_PAD_ENET2_TX_EN__GPIO2_IO13	0x0
+		>;
+	};
+
 	pinctrl_ecspi1_cs: ecspi1-cs-grp {
 		fsl,pins = <
 			MX6UL_PAD_LCD_DATA21__GPIO3_IO26	0x000a0