Update verbose logging flag when SampleDriver is created

Currently, verbose logging is enabled when running VTS tests. This
unnecessarily inflates the running length of these tests.

Test: mma
Test: VtsHalNeuralnetworksV1_[012]TargetTest, inspected logs
Bug: N/A
Change-Id: I2e7ba7cb972fcd79ce71ee84b5f4c786251eccea
diff --git a/driver/sample/SampleDriver.h b/driver/sample/SampleDriver.h
index 5cc6bbf..8c32b43 100644
--- a/driver/sample/SampleDriver.h
+++ b/driver/sample/SampleDriver.h
@@ -39,7 +39,9 @@
    public:
     SampleDriver(const char* name,
                  const IOperationResolver* operationResolver = BuiltinOperationResolver::get())
-        : mName(name), mOperationResolver(operationResolver) {}
+        : mName(name), mOperationResolver(operationResolver) {
+        android::nn::initVLogMask();
+    }
     ~SampleDriver() override {}
     Return<void> getCapabilities(getCapabilities_cb cb) override;
     Return<void> getVersionString(getVersionString_cb cb) override;