Revert "VTS tests for fixed MediaDrm security level APIs"

This reverts commit 45c3855f.

Reason for revert: Build cop here. The CL topic that I'm reverting broke several builds: Drm.h's openSession(Vector<uint8_t> &sessionId) hides overloaded virtual function openSession(DrmPlugin::SecurityLevel securityLevel, ..) from IDrm.h.

https://android-build.googleplex.com/builds/submitted/4598692/full-eng/latest/view/logs/build_error.log

Change-Id: Ie61888464a2ac17b1ee6f47b23f5bb84fdbfa095