Required to allow sysupgrades from OpenWrt 19.07. Closes #7071 Fixes:98fbf2edc0("ath79: move TPLINK_HWID/_HWREV to parent for tplink-safeloader") Tested-by: J. Burfeind <git@aiyionpri.me> Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net> (cherry picked from commit8ba71f1f6f)