Make tester partitioner default partitioner (#300)

Summary:
Pull Request resolved: #300

With our new unified partitioner, This should be the default partitioner that we use for testing our end-to-end xnnpack flow. Later when there is more configurability with partitioner, we can modify this to add these configs in testing

Reviewed By: manuelcandales

Differential Revision: D49214926

fbshipit-source-id: de9fd1b6f67b6fd8faf171679ffbb79e9bcb36d7

Author: mcr229

backends/xnnpack/test/tester/tester.py

@@ -12,9 +12,7 @@
 import torch
 import torch._export as export
 from executorch import exir
-from executorch.backends.xnnpack.partition.xnnpack_partitioner import (
-    XnnpackFloatingPointPartitioner,
-)
+from executorch.backends.xnnpack.partition.xnnpack_partitioner import XnnpackPartitioner
 from executorch.backends.xnnpack.passes import XNNPACKPassManager
 from executorch.backends.xnnpack.utils.configs import (
     get_xnnpack_capture_config,
@@ -184,7 +182,7 @@ def graph_module(self) -> str:
 @register_stage
 class Partition(Stage):
     def __init__(self, partitioner: Optional[Partitioner] = None):
-        self.partitioner = partitioner or XnnpackFloatingPointPartitioner
+        self.partitioner = partitioner or XnnpackPartitioner
         self.delegate_module = None
 
     def run(self, artifact: ExirExportedProgram, inputs=None):