Add TENSOR_QUANT8_ASYMM_SIGNED support for DEQUANTIZE

Add TENSOR_QUANT8_ASYMM_SIGNED to the list of exceptions when mutating
DEQUANTIZE for validation.

Bug: 143934768
Test: VtsHalNeuralnetworksV1_3TargetTest
Change-Id: I1b3b0a362d3949d4e31708388100d4794846ca3a
Merged-In: I1b3b0a362d3949d4e31708388100d4794846ca3a
(cherry picked from commit 2bd0b333)