ARM: dts: rockchip: move rv1108 mmcx aliases to board dts files

As suggested by Arnd Bergmann, mmc-aliases are supposed to be
board-specific, so move the newly added general aliases to
the board-level on rv1108-based boards.
Suggested-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Link: https://lore.kernel.org/r/20210324122235.1059292-2-heiko@sntech.de

arch/arm/boot/dts/rv1108-elgin-r1.dts

@@ -12,6 +12,10 @@ / {
 	model = "Elgin RV1108 R1 board";
 	compatible = "elgin,rv1108-r1", "rockchip,rv1108";
 
+	aliases {
+		mmc0 = &emmc;
+	};
+
 	memory@60000000 {
 		device_type = "memory";
 		reg = <0x60000000 0x08000000>;

arch/arm/boot/dts/rv1108-evb.dts

@@ -8,6 +8,10 @@ / {
 	model = "Rockchip RV1108 Evaluation board";
 	compatible = "rockchip,rv1108-evb", "rockchip,rv1108";
 
+	aliases {
+		mmc0 = &sdmmc;
+	};
+
 	memory@60000000 {
 		device_type = "memory";
 		reg = <0x60000000 0x08000000>;

arch/arm/boot/dts/rv1108.dtsi

@@ -19,9 +19,6 @@ aliases {
 		i2c1 = &i2c1;
 		i2c2 = &i2c2;
 		i2c3 = &i2c3;
-		mmc0 = &emmc;
-		mmc1 = &sdio;
-		mmc2 = &sdmmc;
 		serial0 = &uart0;
 		serial1 = &uart1;
 		serial2 = &uart2;