xDot target missing device_name

### Description
- Type: Bug 
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## Bug

**Target**
Multitech xDot

Export to uvision fails for the xDot due to missing "device_name": "STM32L151CC" in targets.json
it does instead have "progen": {"target": "xdot-l151cc"}

Happy to submit a PR if there is no reason for this to be missing.