ARM: dts: rockchip: move rk322x 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 rk322x-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/rk3228-evb.dts

···
 	model = "Rockchip RK3228 Evaluation board";
 	compatible = "rockchip,rk3228-evb", "rockchip,rk3228";
 
+	aliases {
+		mmc0 = &emmc;
+	};
+
 	memory@60000000 {
 		device_type = "memory";
 		reg = <0x60000000 0x40000000>;

arch/arm/boot/dts/rk3229-evb.dts

···
 	model = "Rockchip RK3229 Evaluation board";
 	compatible = "rockchip,rk3229-evb", "rockchip,rk3229";
 
+	aliases {
+		mmc0 = &emmc;
+	};
+
 	memory@60000000 {
 		device_type = "memory";
 		reg = <0x60000000 0x40000000>;

arch/arm/boot/dts/rk3229-xms6.dts

···
 	model = "Mecer Xtreme Mini S6";
 	compatible = "mecer,xms6", "rockchip,rk3229";
 
+	aliases {
+		mmc0 = &sdmmc;
+		mmc1 = &sdio;
+		mmc2 = &emmc;
+	};
+
 	memory@60000000 {
 		device_type = "memory";
 		reg = <0x60000000 0x40000000>;

arch/arm/boot/dts/rk322x.dtsi

···
 	interrupt-parent = <&gic>;
 
 	aliases {
-		mmc0 = &sdmmc;
-		mmc1 = &sdio;
-		mmc2 = &emmc;
 		serial0 = &uart0;
 		serial1 = &uart1;
 		serial2 = &uart2;