arm64: dts: imx8qm-mek: correct GPIOs for USDHC2 CD and WP signals

The USDHC2 CD and WP sginal should be on LSIO_GPIO5.

Fixes: 307fd14d

 ("arm64: dts: imx: add imx8qm mek support")
Signed-off-by: Shenwei Wang <shenwei.wang@nxp.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>