Enable OpenThread DNS64

Author: SuGlider

configs/defconfig.esp32h2

@@ -8,14 +8,11 @@ CONFIG_FREERTOS_IDLE_TASK_STACKSIZE=2304
 # OpenThread
 #
 CONFIG_OPENTHREAD_ENABLED=y
+CONFIG_OPENTHREAD_DNS64_CLIENT=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