Added tb_sdp_pkg.vhd for sdp test benches.

applications/lofar2/libraries/sdp/hdllib.cfg

@@ -22,7 +22,8 @@ synth_files =
     src/vhdl/sdp_station.vhd
 
 test_bench_files =
-    tb/vhdl/tb_sdp_info.vhd 
+    tb/vhdl/tb_sdp_pkg.vhd
+    tb/vhdl/tb_sdp_info.vhd
     tb/vhdl/tb_sdp_statistics_offload.vhd
     tb/vhdl/tb_tb_sdp_statistics_offload.vhd
     tb/vhdl/tb_sdp_crosslets_subband_select.vhd