Adding OpenWrt support for TP-Link EAP245

The QCA9982 is only use by one other device, but they didn't see any issues so far. This radio also isn't really listed anywhere as 'supported'. The PCI IDs are the same as for the QCA9990, but the firmware just worked, so I didn't think much of it.

Interesting tests you're doing by the way. I just noticed that on my EAP245v1, with a QCA9880 radio, 80MHz AP to station does happen, so at least it is supported by the software stack.