Log NNAPI VTS test case to logcat

Sample output:

    I VtsHalNeuralnetworksV1_2TargetTest: [Test Case] TestGenerated/GeneratedTest.Test/nnapi_sample_all_add BEGIN
    ...
    I VtsHalNeuralnetworksV1_2TargetTest: [Test Case] TestGenerated/GeneratedTest.Test/nnapi_sample_all_add END

Bug: 159060565
Test: VtsHalNeuralnetworksV1_0TargetTest (inspected logcat output)
Test: VtsHalNeuralnetworksV1_1TargetTest (inspected logcat output)
Test: VtsHalNeuralnetworksV1_2TargetTest (inspected logcat output)
Test: VtsHalNeuralnetworksV1_3TargetTest (inspected logcat output)
Change-Id: Ic1a0c90e0853ca84dd925d0f7df65e159bb284aa
diff --git a/neuralnetworks/1.2/vts/functional/Android.bp b/neuralnetworks/1.2/vts/functional/Android.bp
index 182f716..93edca6 100644
--- a/neuralnetworks/1.2/vts/functional/Android.bp
+++ b/neuralnetworks/1.2/vts/functional/Android.bp
@@ -40,6 +40,7 @@
         "CompilationCachingTests.cpp",
         "GeneratedTestHarness.cpp",
         "TestAssertions.cpp",
+        "TestMain.cpp",
         "ValidateBurst.cpp",
         "ValidateModel.cpp",
         "ValidateRequest.cpp",