Add Missing \n to OEC Log

(This is a merge of http://go/wvgerrit/69165)

This printf() in the OEMCrypto Unit Tests was causing two log messages
to run together in the log.

Test: CE CDM Unit Tests
Test: Android Unit Tests
Change-Id: I5a981e201de347fc8fbdc50a94c7227f944f9e8c

libwvdrmengine/oemcrypto/test/oec_device_features.cpp

@@ -133,7 +133,7 @@ void DeviceFeatures::Initialize(bool is_cast_receiver,
   }
   std::string security_level = OEMCrypto_SecurityLevel();
   supports_level_1 = (security_level == "L1");
-  printf("SecurityLevel is %s (%s)",
+  printf("SecurityLevel is %s (%s)\n",
          supports_level_1 ? "Level 1" : "Not Level 1",
          security_level.c_str());
   OEMCrypto_Terminate();