Cleanup NNAPI VTS tests

This CL includes the following cleanups:
* namespace compression
* remove "using" from header files
* remove no-op code, default no-op constructors
* clang-formats the code

Bug: N/A
Test: mma
Test: VtsHalNeuralnetworksV1_*TargetTest
Change-Id: I023997d8686ca65223858eed3a0881f5444ed2d6
Merged-In: I023997d8686ca65223858eed3a0881f5444ed2d6
(cherry picked from commit bbe5dad26674e8fac9570f52814571f626f09a3b)
diff --git a/neuralnetworks/1.0/vts/functional/Utils.cpp b/neuralnetworks/1.0/vts/functional/Utils.cpp
index 5aa2751..5de99fd 100644
--- a/neuralnetworks/1.0/vts/functional/Utils.cpp
+++ b/neuralnetworks/1.0/vts/functional/Utils.cpp
@@ -28,15 +28,13 @@
 #include <algorithm>
 #include <vector>
 
-namespace android {
-namespace hardware {
-namespace neuralnetworks {
+namespace android::hardware::neuralnetworks {
 
 using namespace test_helper;
-using ::android::hardware::neuralnetworks::V1_0::DataLocation;
-using ::android::hardware::neuralnetworks::V1_0::Request;
-using ::android::hardware::neuralnetworks::V1_0::RequestArgument;
-using ::android::hidl::memory::V1_0::IMemory;
+using hidl::memory::V1_0::IMemory;
+using V1_0::DataLocation;
+using V1_0::Request;
+using V1_0::RequestArgument;
 
 constexpr uint32_t kInputPoolIndex = 0;
 constexpr uint32_t kOutputPoolIndex = 1;
@@ -118,6 +116,4 @@
     return outputBuffers;
 }
 
-}  // namespace neuralnetworks
-}  // namespace hardware
-}  // namespace android
+}  // namespace android::hardware::neuralnetworks