ARM: dts: rockchip: unuse the slot-node and deprecate the supports-highspeed for dw-mmc

dw-mmc controller can support multiple slots.
But, there are no use-cases anywhere. So we don't need to support the
slot-node for dw-mmc controller.
And "supports-highspeed" property in dw-mmc is deprecated.
"supports-highspeed" property can be replaced with "cap-sd/mmc-highspeed".
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Tushar Behera <trblinux@gmail.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3066a-bqcurie2.dts

@@ -150,12 +150,8 @@ &mmc0 { /* sdmmc */
 	num-slots = <1>;
 	status = "okay";
 	vmmc-supply = <&vcc_sd0>;
-
-	slot@0 {
-		reg = <0>;
-		bus-width = <4>;
-		disable-wp;
-	};
+	bus-width = <4>;
+	disable-wp;
 };
 
 &mmc1 { /* wifi */
@@ -166,11 +162,8 @@ &mmc1 { /* wifi */
 	pinctrl-names = "default";
 	pinctrl-0 = <&sd1_clk &sd1_cmd &sd1_bus4>;
 
-	slot@0 {
-		reg = <0>;
-		bus-width = <4>;
-		disable-wp;
-	};
+	bus-width = <4>;
+	disable-wp;
 };
 
 &uart0 {

arch/arm/boot/dts/rk3188-radxarock.dts

@@ -181,11 +181,8 @@ &mmc0 {
 	status = "okay";
 	vmmc-supply = <&vcc_sd0>;
 
-	slot@0 {
-		reg = <0>;
-		bus-width = <4>;
-		disable-wp;
-	};
+	bus-width = <4>;
+	disable-wp;
 };
 
 &pinctrl {