Hi,
do not confuse EDP with ELRP.
EDP is Extreme Discovery Protocol, and as the name implies, this is "only" a discovery mechanism. As an AP do not use EDP, there's no need on the switch side to enable it towards APs. Simply enter a "disable edp ports " command to turn it off.
ELRP is Extreme Loop Recovery Protocol, and this feature is intended to protect you from a loop. This feature has some configuration parameters, like exclude, to fine tune it. But this is unrelated to EDP.
Stephane