xbflash: allow users to flash on unknown devices if programming mode is specified

[rradjabi]

https://github.com/Xilinx/XRT/blob/master/src/runtime_src/driver/xclng/tools/xbflash/flasher.h has a lookup table to determine programming mode from VBNVname in Feature ROM. This lookup table has to be updated in order for new devices to be programmed with xbflash. We should override this check if the user specifies a programming mode (don't call getProgrammingTypeFromDeviceName() ).

const std::vector<std::pair<std::string, E_FlasherType>> flashPairs = { std::make_pair( "7v3", BPI ), std::make_pair( "8k5", BPI ), std::make_pair( "ku3", BPI ), std::make_pair( "vu9p", SPI ), std::make_pair( "ku115", SPI ), std::make_pair( "kcu1500", SPI ), std::make_pair( "vcu1525", SPI ), std::make_pair( "vcu1526", SPI ), std::make_pair( "vcu1550", SPI ), std::make_pair( "vcu1551", SPI ), std::make_pair( "vega-4000", SPI ), std::make_pair( "xbb200", SPI ), std::make_pair( "xbb250", SPI ) };

[houlz0507]

fixed by: #207