[dua] fix 1.2 compile issue without DUA flag (#5325)
[dua] fix 1.2 compile issue without DUA flag (#5325)


abtink/openthread,openthread/openthread,openthread/openthread,bukepo/openthread,abtink/openthread,jwhui/openthread,chshu/openthread,jwhui/openthread,chshu/openthread,srickardti/openthread,openthread/openthread,abtink/openthread,bukepo/openthread,chshu/openthread,abtink/openthread,srickardti/openthread,srickardti/openthread,srickardti/openthread,chshu/openthread,chshu/openthread,jwhui/openthread,chshu/openthread,openthread/openthread,jwhui/openthread,bukepo/openthread,bukepo/openthread