The changes are backported from PR2128.
Org Problem: DRIO cannot establish connections with satellite after updatting
the IBUFDS_GTE2 parameters on commit d6704d30e9.
Description of Changes:
- CPLL Parameters are added.
- CEB signal of IBUFDS_GTE2 is asserted by NOT(OR(stable_clkin, GTX CPLL Locked)).
- Modify the GTX Init FSM so that the PLL Reset and GTX Reset are done in two seperated state.
- Restart of GTX module now only resets GTX transceiver.