fixup mgcp_trunk: increase default number of virtual endpoints

In change I55605ea083565b6950d0820e3f72c50c9dc19ffa, the default
number of endpoints was increased to 512, however the
configuration examples were not updated.

Change-Id: I449a612065a5208c9f70ae74f594e8d45eb344cf
Related: OS#4711, SYS#5262
2 files changed