gd: Fix cert tests for LeIso

The parameters were not valid according to the specification;
set missing values for the LE Set Cig Parameters command

The tests are not enabled yet as the Connected Isochronous
Stream supported is not enabled in RootCanal.

Test: None
Bug: 253535400
Change-Id: I5da1bdd5d5da4e9232bafc62c8168e3f7f12539a