Class for reporting the number of completed packets by either the host or the controller over the HCI API.

Although a simple TUint16 would be sufficient, as there are commands that require an array of the type to be provided as RArray instances are used as the API. The type contents RArrays use must be at a minimum 4 bytes in size. This class provides a 4 byte encapsulation of a 2 byte value representing the {Host,HC}NumOfCompletedPackets.