Feature Garmin as a supported vendor

[MrCsabaToth]

Once the Garmin CSC sensor support is tested and verified:

• Adding support for Old Danube kayak ergometer TrackMyIndoorWorkout#384
• Simplify CSC speed or cadence sensor decision based on the BLE device name or CSC Feature TrackMyIndoorWorkout#385

[MrCsabaToth]

Closed accidentally