This is a port of an old commit from mkresin's tree:
09260cdf3e9332978c2a474a58e93a6f2b55f4a8
This has the potential to break sysupgrade but it should be fine as
there is no stable release of LEDE or OpenWrt that support these devices.
Signed-off-by: Rosen Penev <rosenp@gmail.com>