[UrJTAG-dev] Patch: xilinx Artix-7 parts

[steve t. <te...@te...>]

This simple patch adds JTAG IDs for the xilinx Artix-7 family of FPGAs.
The xc7a100t ID has been checked against an actual part and includes the 
urjtag boundary scan file; the rest are from the datasheet.