Fix STS test for CVE-2021-0399

Use android callbacks and intents to get results from other activities

Bug: 175817167
Test: sts-tradefed run sts-engbuild-no-spl-lock -m CtsSecurityTestCases -t android.security.cts.CVE_2021_0339

Change-Id: If277bee63cf06d6c2dae5e54d946830af115dc84
Merged-In: If277bee63cf06d6c2dae5e54d946830af115dc84
1 file changed