fix GraphBuild import (pytorch#23014)

Summary:

Import GraphBuild from its proper location

Reviewed By: rascani

Differential Revision: D121232146

Pull Request resolved: pytorch#23014

Author: JakeStevens

backends/arm/test/passes/test_ioquantization_pass.py

@@ -29,7 +29,7 @@
     TosaLoweringContext,
     TosaSpecification,
 )
-from executorch.backends.cadence.aot.graph_builder import GraphBuilder
+from executorch.backends.test.graph_builder import GraphBuilder
 from executorch.backends.test.harness.stages import StageType
 from executorch.exir.dialects._ops import ops as exir_ops
 from executorch.exir.passes.quantize_io_pass import (