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