ARM: dts: imx8mm: Replace deprecated fsl,usbphy DT props with phys

The fsl,usbphy DT property is deprecated, replace it with phys DT
property and specify #phy-cells, so that the generic PHY framework
can parse the PHY bindings without any extra hacking.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Ye Li <ye.li@nxp.com>
Cc: uboot-imx <uboot-imx@nxp.com>
diff --git a/arch/arm/dts/imx8mm.dtsi b/arch/arm/dts/imx8mm.dtsi
index c824f26..fa2d73f 100644
--- a/arch/arm/dts/imx8mm.dtsi
+++ b/arch/arm/dts/imx8mm.dtsi
@@ -241,6 +241,7 @@
 	};
 
 	usbphynop1: usbphynop1 {
+		#phy-cells = <0>;
 		compatible = "usb-nop-xceiv";
 		clocks = <&clk IMX8MM_CLK_USB_PHY_REF>;
 		assigned-clocks = <&clk IMX8MM_CLK_USB_PHY_REF>;
@@ -249,6 +250,7 @@
 	};
 
 	usbphynop2: usbphynop2 {
+		#phy-cells = <0>;
 		compatible = "usb-nop-xceiv";
 		clocks = <&clk IMX8MM_CLK_USB_PHY_REF>;
 		assigned-clocks = <&clk IMX8MM_CLK_USB_PHY_REF>;
@@ -936,7 +938,7 @@
 				clock-names = "usb1_ctrl_root_clk";
 				assigned-clocks = <&clk IMX8MM_CLK_USB_BUS>;
 				assigned-clock-parents = <&clk IMX8MM_SYS_PLL2_500M>;
-				fsl,usbphy = <&usbphynop1>;
+				phys = <&usbphynop1>;
 				fsl,usbmisc = <&usbmisc1 0>;
 				status = "disabled";
 			};
@@ -955,7 +957,7 @@
 				clock-names = "usb1_ctrl_root_clk";
 				assigned-clocks = <&clk IMX8MM_CLK_USB_BUS>;
 				assigned-clock-parents = <&clk IMX8MM_SYS_PLL2_500M>;
-				fsl,usbphy = <&usbphynop2>;
+				phys = <&usbphynop2>;
 				fsl,usbmisc = <&usbmisc2 0>;
 				status = "disabled";
 			};