arm64: dts: rockchip: Fix mmc-pwrseq clock name on rock-pi-4

The defined name for "mmc-pwrseq-simple" clock is "ext_clock".

Signed-off-by: "Rob Herring (Arm)" <robh@kernel.org>
Link: https://lore.kernel.org/r/20250409205040.1522754-1-robh@kernel.org
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi

@@ -43,7 +43,7 @@
 	sdio_pwrseq: sdio-pwrseq {
 		compatible = "mmc-pwrseq-simple";
 		clocks = <&rk808 1>;
-		clock-names = "lpo";
+		clock-names = "ext_clock";
 		pinctrl-names = "default";
 		pinctrl-0 = <&wifi_enable_h>;
 		reset-gpios = <&gpio0 RK_PB2 GPIO_ACTIVE_LOW>;