Revert "ARM: dts: stm32: Reinstate card detect behavior on ST boards"

Since commit f13ff88b ("gpio: stm32: add ops set_dir_flags")
the gpio flags are supported by stm32 pinctrl driver.

The cd-gpios is correctly handle in U-Boot and the patch on the
device tree can be removed.

This reverts commit 79291924.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>