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 <[e-mail]>
Signed-off-by: Heiko Stuebner <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

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

···
 	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

···
 	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

···
 		i2c1 = &i2c1;
 		i2c2 = &i2c2;
 		i2c3 = &i2c3;
-		mmc0 = &emmc;
-		mmc1 = &sdio;
-		mmc2 = &sdmmc;
 		serial0 = &uart0;
 		serial1 = &uart1;
 		serial2 = &uart2;