[link] fix link raw caps calculation (#2668)
[link] fix link raw caps calculation (#2668)

Allow software implementations of link layer features even when hardware
supports.
erja-gp/openthread,bukepo/openthread,pvanhorn/openthread,openthread/openthread,librasungirl/openthread,turon/openthread,georgecpr/openthread,jwhui/openthread,mszczodrak/openthread,mszczodrak/openthread,lanyuwen/openthread,gandreello/openthread,gandreello/openthread,jwhui/openthread,turon/openthread,mszczodrak/openthread,librasungirl/openthread,pvanhorn/openthread,georgecpr/openthread,erja-gp/openthread,librasungirl/openthread,openthread/openthread,lanyuwen/openthread,chshu/openthread,openthread/openthread,LeZhang2016/openthread,erja-gp/openthread,LeZhang2016/openthread,gandreello/openthread,mszczodrak/openthread,georgecpr/openthread,chshu/openthread,jwhui/openthread,srickardti/openthread,erja-gp/openthread,LeZhang2016/openthread,turon/openthread,gandreello/openthread,abtink/openthread,LeZhang2016/openthread,georgecpr/openthread,LeZhang2016/openthread,erja-gp/openthread,georgecpr/openthread,srickardti/openthread,turon/openthread,erja-gp/openthread,librasungirl/openthread,srickardti/openthread,gandreello/openthread,lanyuwen/openthread,bukepo/openthread,mszczodrak/openthread,gandreello/openthread,chshu/openthread,mszczodrak/openthread,chshu/openthread,chshu/openthread,abtink/openthread,srickardti/openthread,pvanhorn/openthread,abtink/openthread,pvanhorn/openthread,jwhui/openthread,openthread/openthread,georgecpr/openthread,pvanhorn/openthread,lanyuwen/openthread,LeZhang2016/openthread,chshu/openthread,pvanhorn/openthread,bukepo/openthread,lanyuwen/openthread,bukepo/openthread,abtink/openthread,lanyuwen/openthread