Modify VTS to allow testing shim caching

Bug: 185777967
Bug: 182877255
Test: VtsHalNeuralnetworksTargetTest
Change-Id: Ibaba149715cfd5e655ce4916b75a29473170f013
Merged-In: Ibaba149715cfd5e655ce4916b75a29473170f013
(cherry picked from commit 2980a7c9fc50aff7613ac96abd8294bed5560b88)
1 file changed