[dua] fix missing error indication when building DUA functionality (#6960)
[dua] fix missing error indication when building DUA functionality (#6960)

This commit introduces compilation error for building DUA without
SLAAC dependency.
abtink/openthread,srickardti/openthread,abtink/openthread,srickardti/openthread,srickardti/openthread,jwhui/openthread,srickardti/openthread,openthread/openthread,abtink/openthread,abtink/openthread,openthread/openthread,openthread/openthread,jwhui/openthread,jwhui/openthread,jwhui/openthread,openthread/openthread