Add quant8 signed generated tests

Fixes ValidateModel test for AXIS_ALIGNED_BBOX_TRANSFORM.

Bug: 136735770
Test: VtsHalNeuralnetworksV1_3TargetTest
Change-Id: Ie2959ba7258d8106d5b3dd36970181519b75e3b3
Merged-In: Ie2959ba7258d8106d5b3dd36970181519b75e3b3
(cherry picked from commit 16e8c9cc02673d58abaa3011f6708083c43d0489)
1 file changed