ARM: dts: rockchip: Add sdmmc_det pinctrl for RK3128

The pincontrol for sd card detection is currently missing.
Add it.
Signed-off-by: Alex Bee <knaerzche@gmail.com>
Link: https://lore.kernel.org/r/20231119130351.112261-6-knaerzche@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rockchip/rk3128.dtsi

@@ -843,6 +843,10 @@ sdmmc_cmd: sdmmc-cmd {
 				rockchip,pins = <1 RK_PB7 1 &pcfg_pull_default>;
 			};
 
+			sdmmc_det: sdmmc-det {
+				rockchip,pins = <1 RK_PC1 1 &pcfg_pull_default>;
+			};
+
 			sdmmc_wp: sdmmc-wp {
 				rockchip,pins = <1 RK_PA7 1 &pcfg_pull_default>;
 			};