Commitf724a583dcupdated the nand-rb4xx driver to the 5.10 testing kernel, but forgot to add the new kernel config symbol it introduces to the 5.10 config. Fixes:f724a583dc("ath79: mikrotik: update nand-rb4xx driver") Reported-by: Russell Senior <russell@personaltelco.net> Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>