[quant][executorch] Support inception_v4 in examples (#108382)
Summary: Verified that pt2e quant flow matches the fx flow with executorch backend config
Test Plan:
with-proxy buck2 run executorch/examples/quantization:example -- -m=ic4 --verify
```
[INFO 2023-08-31 16:08:06,923 example.py:77] prepare sqnr: inf
[INFO 2023-08-31 16:08:06,932 example.py:81] quant diff max: 0.0
[INFO 2023-08-31 16:08:06,936 example.py:85] quant sqnr: inf
```
full output: https://www.internalfb.com/intern/paste/P818520579/
Differential Revision: D48889075
Pull Request resolved: https://github.com/pytorch/pytorch/pull/108382
Approved by: https://github.com/kimishpatel
