dts: arm: st: u0: usb_fs_phy was erroneously placed under soc

Fixes warning:

Warning (simple_busi_reg): /soc/usbphy: missing or empty reg/ranges
property

Fixes #84880

Signed-off-by: Holger Adams <[email protected]>

Author: h0lad

dts/arm/st/u0/stm32u073.dtsi

@@ -59,11 +59,6 @@
 			clocks = <&rcc STM32_CLOCK(APB1, 13U)>;
 			status = "disabled";
 		};
-
-		usb_fs_phy: usbphy {
-			compatible = "usb-nop-xceiv";
-			#phy-cells = <0>;
-		};
 	};
 
 	sram1: memory@20000000 {
@@ -75,4 +70,9 @@
 		compatible = "zephyr,memory-region", "mmio-sram";
 		zephyr,memory-region = "SRAM2";
 	};
+
+	usb_fs_phy: usbphy {
+		compatible = "usb-nop-xceiv";
+		#phy-cells = <0>;
+	};
 };