rk3566: Remove fifo mode from sdmmc0

Doesn't look like it's needed for the rk3566 like it was for
previous SoCs.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>

arch/arm/dts/rk3566-anbernic-rg503-u-boot.dtsi

@@ -9,11 +9,12 @@
 	aliases {
 		mmc0 = &sdmmc0;
 		mmc1 = &sdmmc1;
+		mmc2 = &sdmmc2;
 	};
 
 	chosen {
 		stdout-path = &uart2;
-		u-boot,spl-boot-order = "same-as-spl", &sdmmc0;
+		u-boot,spl-boot-order = "same-as-spl", &sdmmc0, &sdmmc1;
 	};
 
 	rng: rng@fe388000 {
@@ -68,10 +69,6 @@
         /delete-property/ clock-names;
 };
 
-&sdmmc0 {
-	u-boot,spl-fifo-mode;
-};
-
 &uart2 {
 	clock-frequency = <24000000>;
 	u-boot,dm-spl;