ARM: dts: rockchip: clean up rk3xxx mmc nodes

Commit 356649ab ("ARM: dts: rockchip: unuse the slot-node and deprecate
the supports-highspeed for dw-mmc") removed the slots but not the #xx-cells
properties describing the subnodes. Do this now.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3xxx.dtsi

@@ -118,8 +118,6 @@ mmc0: dwmmc@10214000 {
 		compatible = "rockchip,rk2928-dw-mshc";
 		reg = <0x10214000 0x1000>;
 		interrupts = <GIC_SPI 23 IRQ_TYPE_LEVEL_HIGH>;
-		#address-cells = <1>;
-		#size-cells = <0>;
 
 		clocks = <&cru HCLK_SDMMC>, <&cru SCLK_SDMMC>;
 		clock-names = "biu", "ciu";
@@ -131,8 +129,6 @@ mmc1: dwmmc@10218000 {
 		compatible = "rockchip,rk2928-dw-mshc";
 		reg = <0x10218000 0x1000>;
 		interrupts = <GIC_SPI 24 IRQ_TYPE_LEVEL_HIGH>;
-		#address-cells = <1>;
-		#size-cells = <0>;
 
 		clocks = <&cru HCLK_SDIO>, <&cru SCLK_SDIO>;
 		clock-names = "biu", "ciu";