Update defconfig.esp32c6 to disable OpenThread DNS64

Author: SuGlider

configs/defconfig.esp32c6

@@ -15,7 +15,11 @@ CONFIG_OPENTHREAD_ENABLED=y
 # Border Router disabled
 # CONFIG_OPENTHREAD_BORDER_ROUTER=y
 # CONFIG_OPENTHREAD_RADIO_SPINEL_UART=y
+
+# DNS64 and NAT64 will be disabled for a while
+# OT IDF issue https://github.com/espressif/esp-idf/issues/15069
 CONFIG_OPENTHREAD_DNS64_CLIENT=y
+
 # Radio for RPC
 # CONFIG_OPENTHREAD_RADIO=y 
 # CONFIG_OPENTHREAD_RADIO_NATIVE=y