arm64: dts: freescale: imx8mm-verdin: enable hysteresis on slow input pin

SODIMM 17 can be used as an edge triggered interrupt supplied from an
off board source.

Enable hysteresis on the pinmuxing to increase immunity against noise
on the signal.

Fixes: 60f01b5b

 ("arm64: dts: imx8mm-verdin: update iomux configuration")
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>