[quant] support linear_relu_dynamic for qnnpack backend (#63820)

[quant] support linear_relu_dynamic for qnnpack backend (#63820)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63820

Adds support in the operator directly to call relu operator if relu fusion is enabled.
Once QNNPACK natively supports relu fusion in the linear_dynamic this can be removed

Test Plan:
python test/test_quantization.py TestDynamicQuantizedLinear.test_qlinear

Imported from OSS

Reviewed By: vkuzo

Differential Revision: D30502813

fbshipit-source-id: 3352ee5f73e482b6d1941f389d720a461b84ba23