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/1.2/vts/functional/BasicTests.cpp b/neuralnetworks/1.2/vts/functional/BasicTests.cpp
index 5c269df..86849d5 100644
--- a/neuralnetworks/1.2/vts/functional/BasicTests.cpp
+++ b/neuralnetworks/1.2/vts/functional/BasicTests.cpp
@@ -18,13 +18,10 @@
 
 #include "VtsHalNeuralnetworks.h"
 
-namespace android {
-namespace hardware {
-namespace neuralnetworks {
-namespace V1_2 {
-namespace vts {
-namespace functional {
+namespace android::hardware::neuralnetworks::V1_2::vts::functional {
 
+using V1_0::DeviceStatus;
+using V1_0::ErrorStatus;
 using V1_0::PerformanceInfo;
 
 // create device test
@@ -113,9 +110,4 @@
             });
     EXPECT_TRUE(ret.isOk());
 }
-}  // namespace functional
-}  // namespace vts
-}  // namespace V1_2
-}  // namespace neuralnetworks
-}  // namespace hardware
-}  // namespace android
+}  // namespace android::hardware::neuralnetworks::V1_2::vts::functional