Add TENSOR_QUANT8_ASYMM_SIGNED support for DEPTHWISE_CONV_2D

Fix: 143935136
Test: quantization coupling tests in CTS and VTS
Change-Id: I61a76588e74332e4acd210d99670269730bf9b4d
Merged-In: I61a76588e74332e4acd210d99670269730bf9b4d
(cherry picked from commit d278c58420c8f8b26060b73c5ca79f620be7544f)
4 files changed