Update model parameters for V2T behavioral model

[sgherbst]

Parameters to check:

• Nominal value for Vcal
• Nominal value for VSupl
• Value for Iunit at nominal value of Vcal
• Nominal value for Vgain (i.e. attenuation of sampled voltage due to parasitic capacitance)
• Nominal value for Td_comp (i.e. delay through inverter chain)
• Nominal value for Cs_eff
• Nominal value for Vlth (threshold of inverter that serves as a comparator)
• Check math on lines 59 of V2T model -- what is this representing?
  

  dragonphy2/vlog/new_cpu_models/analog_core/V2T.sv

  Line 59 in 2d280b9

  Vdch_cm = VSupl - (VSupl/4.0 + v2t_obj.Vcm_AC_max);

[sgherbst]

@sjkim85 are you happy with the current values we have for these parameters? Or do we still need to update them?