NNAPI Burst object cleanup -- VTS update

This CL adapts the VTS code to the corresponding changes made in the NN
utility library.

Bug: 119570067
Test: mma
Test: atest VtsHalNeuralnetworksV1_0Target
Test: atest VtsHalNeuralnetworksV1_1Target
Test: atest VtsHalNeuralnetworksV1_2Target
Change-Id: I7cbc1d7025c0352aa1ed29d71dc84c2fcfc20a4f
Merged-In: I7cbc1d7025c0352aa1ed29d71dc84c2fcfc20a4f
(cherry picked from commit e68668f6)