adding Kintex-7 support
Kintex7 support includes 16-bit PCS interface, Kintex7 GTX wrapper and a reference top design (top/kintex7_ref_design/wr_core_demo/).
Kintex7 support includes 16-bit PCS interface, Kintex7 GTX wrapper and a reference top design (top/kintex7_ref_design/wr_core_demo/).