Supported Smartphones: add Samsung S21

[janusw]

• everything supported (no surprise, since the S20 already did that)
• nRF Connect shows support for Coded PHY and Extended Advertisements
• BT 5 has been verified with a DroneTag Mini (and other devices), and the reception is continuous without gaps
• WiFi Beacon has been verified with a Parrot Anafi
• WiFi Aware support is shown in AIDA64 (but I have no sender device to verify it)
• all of this was tested with an S21+ (but I assume the S21 and S21 Ultra variants behave the same way)
• using ODID 3.0 (and another receiver app)

[friissoren]

Thanks for testing.

[janusw]

Dang, I just noticed that I partly messed up the year (copy'n'paste issue). Let me quickly fix that up ...