qualcommax: Fix Buffalo WXR-5950AX12 wifi MAC

qualcommax: Fix Buffalo WXR-5950AX12 wifi MAC

Currently, WiFi interfaces on WXR-5950AX12 / WXR-6000AX12 devices
come up with some MAC addresses inconsistent with vendor and Ethernet
addresses. This adds a hotplug override in order to make it consistent
with what is in u-boot env as well as OAM firmware where 1st radio MAC
is set at Ethernet MAC + 8, and 2nd radio mac at Ethernet MAC + 16.

    fw_printenv | grep addr
    ethaddr=68:e1:dc:xx:xx:d8
    ipaddr=192.168.11.1
    wlan0addr=68:e1:dc:xx:xx:e0
    wlan1addr=68:e1:dc:xx:xx:e8
    wlan2addr=00:00:00:00:00:00

For OEM bootlog and MAC assagnment check
https://openwrt.org/toh/buffalo/wxr-5950ax12#openwrt_uimage_tftp_bootlog

Tested-by: Samir Ibradžić <sibradzic@gmail.com> # Buffalo WXR-6000AX12P
Signed-off-by: Samir Ibradžić <sibradzic@gmail.com>