[C72 Mini][DTS][WDT] Disable internal watchdog

The internal watchdog was interfering with the external APX watchdog.

arch/arm64/boot/dts/seco/seco-imx8mm-c72.dts

@@ -489,3 +489,7 @@
 &vpu_h1 {
 	status = "okay";
 };
+
+&wdog1 {
+	status = "disabled";
+};