[VTA] Infinite recursive device_api.ext_dev call fix. (#3843)
Issue when try vta on fpga board, would see a Infinite recursive device_api.ext_dev issue that cause stack overflow and vta failed. Analysis: device_api.ext_dev function in rpc_server.py is use to load vta library, once vta library get load, device_api.ext_dev would get replaced with vta function by vta library, vta device_api.cc did such work, but because a logic issue in VTA.cmake, the said file not get compiled, then vta would keep failing on rpc_server.py. Solution: fix the logic issue in VTA.cmake.
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