machine:mx8m:dt: Fixed the devicetrees for mx8mm/mx8mp

In Yocto Kirkstone, we use the 5.15.5 kernel from NXP for the i.MX8 devices. In the kernel repository we moved all G&F and K&K devicetrees to a new folder called seconorth. Edit the machine configurations to reflect this change and build the correct devicetrees.

recipes-kernel/linux/linux-seconorth-5.10/imx6ullguf/defconfig

@@ -135,6 +135,7 @@ CONFIG_MOUSE_PS2=m
 CONFIG_MOUSE_PS2_ELANTECH=y
 CONFIG_INPUT_TOUCHSCREEN=y
 CONFIG_TOUCHSCREEN_ADS7846=y
+CONFIG_TOUCHSCREEN_ATMEL_MXT=y
 CONFIG_TOUCHSCREEN_EGALAX=y
 CONFIG_TOUCHSCREEN_GOODIX=y
 CONFIG_TOUCHSCREEN_MAX11801=y