Adds TENSOR_QUANT8_SYMM support to test infrastructure

This is needed to be able to test DEQUANTIZE after adding
TENSOR_QUANT8_SYMM support.

Test: NeuralNetworksTest_static
Test: VtsHalNeuralnetworksV1_2TargetTest
Change-Id: Iba9b286df70919d7b67cd77c91e625a044bd686c
Merged-In: Iba9b286df70919d7b67cd77c91e625a044bd686c
(cherry picked from commit bf26a9e3)