It depends how you have it configured, if you have the APs and the controller sharing the same management policy and you want to specifically disable the snmp for that AP model, and not the other devices on the network, the easiest is to replicate the same management policy with different name, disable the snmp as per previous comment, and apply that to that AP profile, configured on the controller. If you want to disable all devices you are good to go to disable that on the general management policy.