Propagate ANNMemory_free to IBurstContext::freeMemory -- VTS update

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

Bug: 128319484
Test: mma
Test: atest VtsHalNeuralnetworksV1_0Target
Test: atest VtsHalNeuralnetworksV1_1Target
Test: atest VtsHalNeuralnetworksV1_2Target
Change-Id: I470e8228cde2b75620ad851e4fe408f8e8329e7c
Merged-In: I470e8228cde2b75620ad851e4fe408f8e8329e7c
(cherry picked from commit 102e0442)