Fix Externally reported security issue

static Vector<uid_t> trustedUids;

static bool isProtectedCallAllowed() {

    // TODO

    // Following implementation is just for reference.

    // Each OEM manufacturer should implement/replace with their own solutions.

    IPCThreadState* ipcState = IPCThreadState::self();

    uid_t uid = ipcState->getCallingUid();

    for (unsigned int i = 0; i < trustedUids.size(); ++i) {

        if (trustedUids[i] == uid) {

            return true;

        }

    }

    return false;

}

void DrmManagerService::instantiate() {

    ALOGV("instantiate");