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.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>