ARM: dts: rockchip: Fix typo in rk3288 sdmmc card detect pin name

The card detect pin is currently called sdmcc-cd.
This patch fixes the typo and renames the pin to sdmmc-cd.
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3288.dtsi

@@ -1157,7 +1157,7 @@ sdmmc_cmd: sdmmc-cmd {
 				rockchip,pins = <6 21 RK_FUNC_1 &pcfg_pull_up>;
 			};
 
-			sdmmc_cd: sdmcc-cd {
+			sdmmc_cd: sdmmc-cd {
 				rockchip,pins = <6 22 RK_FUNC_1 &pcfg_pull_up>;
 			};