Ported the gigabit transceiver configuration IP that is used by tr_nonbonded...

Ported the gigabit transceiver configuration IP that is used by tr_nonbonded from $UNB to $RADIOHDL.
Renamed the entities and files names to match the naming convention with ip_<ip_lib>_<ip_name> as prefix.
The IP is created for intended_device_family attribute "Stratix IV", so therefor use postfix '_stratixiv'.
In tr_nonbonded for UniBoard1 typically 4, 8 or 12 transceivers are used on each side of the FPGA.
This gxb_reconfig for 2 transceivers is typically intended for PHY simulation with less transceivers.