Sheldon Wang 1482d6d9af [ALPS04817575] Add system property only for MTK system image
[Solution]
When run VTS test, theres no WOS module due to its AOSP system image.
So we need to skip the edpg related function.

MTK-Commit-Id: 8f8e5faded18d6bcee1eb96dba37a2d708f3995f

Change-Id: I9cee39eea1dd75bccf6cc442f16ed3fe4e72ae95
CR-Id: ALPS04817575
Feature: WiFi Calling Service
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