updated ring design and added testbench

applications/lofar2/designs/lofar2_unb2b_ring/hdllib.cfg

...ip/qsys_lofar2_unb2b_ring/qsys_lofar2_unb2b_ring_cpu_0.ip

...2_unb2b_ring/qsys_lofar2_unb2b_ring_reg_dp_xonoff_ring.ip

...nb2b_ring/qsys_lofar2_unb2b_ring_reg_ring_input_select.ip

...gns/lofar2_unb2b_ring/quartus/qsys_lofar2_unb2b_ring.qsys

...r2_unb2b_ring/revisions/lofar2_unb2b_ring_full/hdllib.cfg

...ar2_unb2b_ring/revisions/lofar2_unb2b_ring_one/hdllib.cfg

.../designs/lofar2_unb2b_ring/src/vhdl/lofar2_unb2b_ring.vhd

...igns/lofar2_unb2b_ring/src/vhdl/lofar2_unb2b_ring_pkg.vhd

...igns/lofar2_unb2b_ring/src/vhdl/mmc_lofar2_unb2b_ring.vhd

...lofar2_unb2b_ring/src/vhdl/qsys_lofar2_unb2b_ring_pkg.vhd

...esigns/lofar2_unb2b_ring/tb/vhdl/tb_lofar2_unb2b_ring.vhd

applications/lofar2/libraries/sdp/src/vhdl/sdp_pkg.vhd

libraries/base/dp/src/vhdl/dp_block_validate_bsn_at_sync.vhd

libraries/base/ring/src/vhdl/ring_info.vhd

libraries/base/ring/src/vhdl/ring_pkg.vhd

libraries/base/ring/src/vhdl/ring_rx.vhd

libraries/base/ring/src/vhdl/ring_tx.vhd