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.

libraries/technology/altera/altera_mf/hdllib.cfg

@@ -16,6 +16,7 @@ synth_files =
     ip_altera_mf_fifo_sc.vhd
     ip_altera_mf_ddio_in.vhd
     ip_altera_mf_ddio_out.vhd
+    ip_altera_mf_gxb_reconfig_2_stratixiv
     ip_altera_mf_gxb_reconfig_4_stratixiv
     ip_altera_mf_gxb_reconfig_8_stratixiv
     ip_altera_mf_gxb_reconfig_12_stratixiv