ath79: add support for TP-Link EAP265 HD
The EAP265 HD is a rebadged EAP245v3, so images are compatible with both
devices.
Link: https://fccid.io/TE7EAP265HD/Letter/6-Request-for-FCC-Change-ID-4823578.pdf
Signed-off-by: Sander Vanheule <[email protected]>