library/BSSAP_LE_Types: fix: add missing FIELDLENGTH attributes

Otherwise TITAN would refuse to decode any messages:

  Dynamic test case error: While RAW-decoding type
  '@BSSAP_LE_Types.PDU_BSSAP_LE': Can not decode type
  '@BSSAP_LE_Types.PDU_BSSAP_LE', because invalid message was received

Change-Id: I3db7e8784efd067ccf0bc7dbc234d9b4ff1c033c
Related: OS#4597
1 file changed