[network-data] changing kMaxServerDataSize and kMaxServiceDataSize to #defines (#2408)
[network-data] changing kMaxServerDataSize and kMaxServiceDataSize to #defines (#2408)

The size of the server and service data is not really an enum.
Additionally the formatting of the enum was different from the other enums.
LeZhang2016/openthread,lanyuwen/openthread,bukepo/openthread,gandreello/openthread,chshu/openthread,abtink/openthread,mszczodrak/openthread,georgecpr/openthread,erja-gp/openthread,xiaom-GitHub/openthread,lanyuwen/openthread,LeZhang2016/openthread,gandreello/openthread,LeZhang2016/openthread,chshu/openthread,gandreello/openthread,openthread/openthread,openthread/openthread,georgecpr/openthread,mszczodrak/openthread,pvanhorn/openthread,georgecpr/openthread,chshu/openthread,erja-gp/openthread,srickardti/openthread,librasungirl/openthread,pvanhorn/openthread,openthread/openthread,erja-gp/openthread,pvanhorn/openthread,LeZhang2016/openthread,mszczodrak/openthread,xiaom-GitHub/openthread,lanyuwen/openthread,xiaom-GitHub/openthread,chshu/openthread,mszczodrak/openthread,erja-gp/openthread,abtink/openthread,lanyuwen/openthread,gandreello/openthread,bukepo/openthread,mszczodrak/openthread,lanyuwen/openthread,lanyuwen/openthread,turon/openthread,librasungirl/openthread,abtink/openthread,chshu/openthread,jwhui/openthread,bukepo/openthread,librasungirl/openthread,pvanhorn/openthread,jwhui/openthread,jwhui/openthread,srickardti/openthread,gandreello/openthread,erja-gp/openthread,erja-gp/openthread,gandreello/openthread,LeZhang2016/openthread,openthread/openthread,turon/openthread,librasungirl/openthread,jwhui/openthread,pvanhorn/openthread,chshu/openthread,mszczodrak/openthread,georgecpr/openthread,turon/openthread,turon/openthread,xiaom-GitHub/openthread,xiaom-GitHub/openthread,LeZhang2016/openthread,bukepo/openthread,georgecpr/openthread,xiaom-GitHub/openthread,srickardti/openthread,georgecpr/openthread,abtink/openthread,srickardti/openthread,pvanhorn/openthread