STS test fix for Android Security CVE-2020-0106

Fix to add bypass check for USER_SYSTEM

Test: sts-tradefed run sts-engbuild-no-spl-lock -m CtsAppSecurityHostTestCases
Bug: 151667817
Bug: 148414207
Change-Id: I03d856c0553a5468f1769379ae3696135c7dbbb8
1 file changed