Changes

Corrected decoding of MSISDN IE and IMEI IE

          1   2   3   4   5   6   7   8
        +-------------------------------+
        | MSISDN IE type            |Res| octet 1
        +-------------------------------+
        | Length of IE content          | octet 2
        +-------------------------------+
        | Length of BCD content         | octet 3
        +-------------------------------+
        | Digit 1       | Digit 2       | octet 4..n
        | ....          |               |
        +-------------------------------+

The length of the BCD content specifies how many subsequent octets
contain BCD data (it does *not* indicate the number of digits).
This length must be less than the total length of the IE content.
Any octets following the BCD content shall be ignored.

Related: OS#6797
Change-Id: Idd2bee3d8f662d028001392cfd0332a265fbc91a