Currently, the build process copies the .twr and .syr files into the
build/ process after running ISE. For a succinct utilization report,
those files are not suitable, though, because they contain too much
information.
However, the build process already produces a custom, short utilization
report using grep and a summary of those reports. This patch modifies
the build such that the same output is copied into
a usrp_$product_fpga.rpt file, similar to our gen-3 devices.
Original-commit: 3a9f3204842d9851fef0e87b6b7d27261624a7fc