boards: fanke: fk723m1_zgt6: remove U suffix from "clocks" in DTS

Remove useless U suffix from this board's DTS.

Signed-off-by: Mathieu CHOPLAIN <[email protected]>

Author: mathieuchopstm

boards/fanke/fk723m1_zgt6/fk723m1_zgt6.dts

@@ -120,7 +120,7 @@ zephyr_udc0: &usbotg_hs {
 	pinctrl-0 = <&sdmmc1_d0_pc8 &sdmmc1_d1_pc9 &sdmmc1_d2_pc10
 		&sdmmc1_d3_pc11 &sdmmc1_ck_pc12 &sdmmc1_cmd_pd2>;
 	pinctrl-names = "default";
-	clocks = <&rcc STM32_CLOCK(AHB3, 16U)>,
+	clocks = <&rcc STM32_CLOCK(AHB3, 16)>,
 		<&rcc STM32_SRC_PLL1_Q SDMMC_SEL(0)>;
 	disk-name = "SD";
 	status = "okay";