Refactor AVGPOOL micro-kernel parameters

- Rename f32_avgpool_params to f32_scaleminmax_params
- Rename multiplier->scale, output_min->min, output_max->max

PiperOrigin-RevId: 305611410
diff --git a/src/xnnpack/operator.h b/src/xnnpack/operator.h
index 15f8efd..3ca786a 100644
--- a/src/xnnpack/operator.h
+++ b/src/xnnpack/operator.h
@@ -243,10 +243,10 @@
     // Parameters for Global Average Pooling in CHW layout
     union xnn_f32_gavgpool_params f32_gavgpool_params;
     union xnn_f32_hswish_params f32_hswish_params;
-    // Pixelwise Average Pooling normally use f32_minmax_params, but also initialize f32_avgpool_params in case it needs
-    // to switch to Global Average Pooling operation.
+    // Pixelwise Average Pooling normally use f32_minmax_params, but also initialize
+    // f32_scaleminmax_params in case it needs to switch to Global Average Pooling operation.
     struct {
-      union xnn_f32_avgpool_params f32_avgpool_params;
+      union xnn_f32_scaleminmax_params f32_scaleminmax_params;
       union xnn_f32_minmax_params f32_minmax_params;
     };
     union xnn_f32_spchw_params f32_spchw_params;