Move more devices to the IPv6-only network

Add common/ipv6_only.yaml to mcu-clock-1, mcu-desk-lamp, mcu-dimmer,
mcu-fireplace, mcu-gate, mcu-heater, mcu-kitchen, mcu-mains-power,
mcu-nspanel-office-r, mcu-office-r, mcu-patio, mcu-pow-dishwasher,
mcu-rf, mcu-shed, mcu-well.

mcu-kitchen.yaml

@@ -36,6 +36,7 @@ esp32:
 
 packages:
   common: !include common/common.yaml
+  ipv6_only: !include common/ipv6_only.yaml
 
 api:
   reboot_timeout: 300s