[XNNPACK][QS8] torch.nn.ELU (#104307)

Differential Revision: [D47075933](https://our.internmc.facebook.com/intern/diff/D47075933/)
Pull Request resolved: #104307
Approved by: https://github.com/digantdesai

Author: mcr229

torch/ao/quantization/backend_config/executorch.py

@@ -346,6 +346,7 @@ def _get_share_qparams_ops_configs() -> List[BackendPatternConfig]:
     ]
     share_qparams_ops = [
         F.adaptive_avg_pool2d,
+        F.elu,
         F.hardtanh,
         F.max_pool2d,
         F.pad,
@@ -355,6 +356,7 @@ def _get_share_qparams_ops_configs() -> List[BackendPatternConfig]:
         F.leaky_relu_,
         torch.nn.AdaptiveAvgPool2d,
         torch.nn.ConstantPad2d,
+        torch.nn.ELU,
         torch.nn.MaxPool2d,
         torch.nn.ReLU6,
         torch.nn.Hardtanh,