PID 0xea60 = 60000 , not 600000 (which is well beyond any valid PID)

This adds support for the full-sized FMUv4PRO design and the FMUv5 STM32F7 based generation.

* Fix minor spelling error

* Added support for the AUAV x2.1 Flight Controller
    also removed a duplicate entry for MindPX
    from src/comm/USBBoardInfo.json

Adds entries required to correctly identify, download and flash PX4
firmware to the AUAV X2.1 Flight Controller

* Update USBBoardInfo.json

Removed un-needed fallback entries. This has been tested!