library/RLCMAC_CSN1_Types: fix length field in GprsMobileAllication

  - Length of field 'MA_BITMAP' is specified in bits, not bytes;
  - The value range of field MA_LENGTH is 0..63, therefore:
    - value  0 means that field 'MA_BITMAP' is  1 bit long,
    - value  1 means that field 'MA_BITMAP' is  2 bits long,
    - value 63 means that field 'MA_BITMAP' is 64 bits long.

Change-Id: Iec19da18637febfa15bc09175bc51504c721c42f
Related: SYS#4868, OS#4547
1 file changed