[mle] set appropriate Response TLV length in SendChildUpdateResponse (#4400)
[mle] set appropriate Response TLV length in SendChildUpdateResponse (#4400)


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