Represents a flow group to drop precedence (DP) map. The
octet string consists of eight octets, one for each flow
group. The position in the string represents the flow
group, where the first (left-most) position represents flow
group 0. The value of the octet represents the mapped drop
precedence for the flow group, where the value of zero
represents drop precedence 0 and so on. The drop precedence
must be in the range 0 to (ethDevCapDropPrecedenceLevels -
1).