GSUP_Emulation: Update internal tables to allow 256 sessions

Other Emulations like GTPv2 and DIAMETER already support that number of
sessions. Increase it to the same number in GSUP_Emulation to allow
handling a high amount of concurrent sessions while testing ePDG.

Change-Id: I9ce650140fc372debc85b603a20bbe9ea165c972
1 file changed