The software drivers are located in a directory with an incorrect name (eth_avb_endpoint_v2_02_a/).
This prevented the software drivers from being automatically found from a User pcore library by the Embedded Development Kit.
This issue can be resolved by renaming the directory to avb_v2_02_a/.
This issue has also been resolved in the version 2.2 Rev 1 patch. For the patch and download instructions, see:
(Xilinx Answer 33305) LogiCORE IP Ethernet AVB Endpoint v2.2 - Release Notes and Known Issues for ISE 11.3 software