[quant][pt2e] Add support for dynamic quantization with symmetric quant for input (#94854)
Summary:
Previously we assumed asymmetric quantization for dynamic quantization, this diff adds the support of symmetric quantization
for the input in dynamic quantization
Test Plan: buck run executorch/exir/tests:quant_lowering_custom_backend_pass -- "executorch.exir.tests.test_quant_lowering_custom_backend_pass.TestQuantLoweringCustomBackendPass.test_quantized_linear_dynamic"
Reviewed By: digantdesai
Differential Revision: D43134794
Pull Request resolved: https://github.com/pytorch/pytorch/pull/94854
Approved by: https://github.com/digantdesai
