ARM: dts: rockchip: Fix supply node for card's power on phycore som

The card is powered by the RK818 switch vdd_sd which is supplied
by VCC9 (VDD_3V3_IO).
Signed-off-by: Wadim Egorov <w.egorov@phytec.de>
Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3288-phycore-rdk.dts

@@ -265,7 +265,7 @@ &sdmmc {
 	disable-wp;
 	pinctrl-names = "default";
 	pinctrl-0 = <&sdmmc_clk &sdmmc_cmd &sdmmc_cd &sdmmc_bus4>;
-	vmmc-supply = <&vdd_io_sd>;
+	vmmc-supply = <&vdd_sd>;
 	vqmmc-supply = <&vdd_io_sd>;
 	status = "okay";
 };