octeon: ubnt-usg: add board name to supported devices

octeon: ubnt-usg: add board name to supported devices

The on-device board name reported by 'ubus call system board' is not present
in the generated profiles.json.  This results in upgrade tools being unable
to match the image with the proper device.  Let's add a 'SUPPORTED_DEVICES'
entry for the board name to fix this.

Links: https://forum.openwrt.org/t/owut-openwrt-upgrade-tool/200035/441
Links: https://github.com/openwrt/openwrt/commit/2a07270180ed0e295d854d6e9e59c78c40549efc
Signed-off-by: Eric Fahlgren <ericfahlgren@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/17736
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>