Changes

saip: rework file sizes for "half-defined" template files

Some templates (e.g. for 5GS) define files which aren't completely defined.
5GS SUCI_Calc_Info: doesn't have a file size defined.

The saip tool will crash in
TODO: add crash

Change-Id: I7c4a0914aef1049a416e6b091f23daab39a1dd9c