libnm: add "Since:" annotation to NM_WIFI_DEVICE_CAP_FREQ_6GHZ
Summary
The enum value is public API; indicate when it was introduced.
Fixes: 8f438d8d ('wifi: add 6ghz device capability flag')
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The enum value is public API; indicate when it was introduced.
Fixes: 8f438d8d ('wifi: add 6ghz device capability flag')