Combined GBT wrapper for V7 and KCU into one file
requested to merge phase2/FLX-1533_VC709LPGBT_UnifyGBTWrapper into phase2/master_FLX-1533_VC709LPGBT
Unified GBT Wrapper for Virtex7 and KCU into one file. This should fix the timing problems for Virtex7. (Adds some XPM_CDC).