If you use the addon TidyPlates, it will put the CC icon along with DoT/HoT icons over the name plates (as well as an easy was of monitoring multi-target threat)
If you don't want to change your nameplate addon, you can use PlateBuffs - it adds overhead buffs/debuffs to all nameplate addons, including the default.
TidyPlates will do the trick. If you just want to show Crowd Control abilities put it on "Show specific debuffs" and just type in the crowd control abilities you want it to display.