configs: imx8mn_beacon: Disable the WDT autostart

Auto-starting the WDT can cause false reboots when the user
is not intentionally trying to use the WDT, so leave it off until
it is requested.

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/configs/imx8mn_beacon_defconfig b/configs/imx8mn_beacon_defconfig
index cfff20f..d1c27ce 100644
--- a/configs/imx8mn_beacon_defconfig
+++ b/configs/imx8mn_beacon_defconfig
@@ -150,4 +150,5 @@
 CONFIG_USB_GADGET_VENDOR_NUM=0x0525
 CONFIG_USB_GADGET_PRODUCT_NUM=0xa4a5
 CONFIG_CI_UDC=y
+# CONFIG_WATCHDOG_AUTOSTART is not set
 CONFIG_IMX_WATCHDOG=y