[codemod] Del un at::native::metal @ MPSCNNFullyConnectedOp.h:6 (export D59157302) (#133515)

Manual export of D59157302

Original description:
Removes a using namespace from the global namespace in pursuit of enabling -Wheader-hygiene. Qualifies instances that relied on the using namespace.

@diff-train-skip-merge
Pull Request resolved: https://github.com/pytorch/pytorch/pull/133515
Approved by: https://github.com/kit1980, https://github.com/malfet
diff --git a/aten/src/ATen/native/metal/mpscnn/MPSCNNFullyConnectedOp.h b/aten/src/ATen/native/metal/mpscnn/MPSCNNFullyConnectedOp.h
index 297b180..04116b5 100644
--- a/aten/src/ATen/native/metal/mpscnn/MPSCNNFullyConnectedOp.h
+++ b/aten/src/ATen/native/metal/mpscnn/MPSCNNFullyConnectedOp.h
@@ -3,11 +3,10 @@
 #import <ATen/native/metal/mpscnn/MPSCNNConvOp.h>
 #import <Foundation/Foundation.h>
 
-using namespace at::native::metal;
 API_AVAILABLE(ios(11.0), macos(10.13))
 @interface MPSCNNFullyConnectedOp : NSObject<MPSCNNOp>
 + (MPSCNNFullyConnectedOp*)linear:(const Conv2DParams&)params
                           weights:(float*)w
                              bias:(float*)b
                      neuronFilter:(NeuronType)t;
-@end
+@end
\ No newline at end of file