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, but 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