Add TENSOR_QUANT8_ASYMM_SIGNED support for GROUPED_CONV_2D op Test: quantization coupling tests in CTS and VTS Bug: 143934585 Change-Id: I4581745838b2919af53dc13bbdb22997f53ecc4d Merged-In: I4581745838b2919af53dc13bbdb22997f53ecc4d (cherry picked from commit cab04439c751fe7ec1eb48cf1f58879943ca5aec)