[style] remove c++11 check and OT_NCP_CONST (#5132)
[style] remove c++11 check and OT_NCP_CONST (#5132)


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