Arm backend: Clean up stale imports

Remove unused compile spec imports and fix invalid noqa markers.

Signed-off-by: Sebastian Larsson <sebastian.larsson@arm.com>
Change-Id: Idd6ad1c63add3b5e83d7d39650f4266a5a3127c3

Author: Sebastian-Larsson

backends/arm/test/misc/test_tosa_dialect_conv2d.py

@@ -4,7 +4,7 @@
 # LICENSE file in the root directory of this source tree.
 
 
-import executorch.backends.arm.tosa.dialect  # noqa: unused
+import executorch.backends.arm.tosa.dialect  # noqa: F401
 import pytest
 import torch
 from executorch.backends.arm.tosa.dialect.lib import TosaValueError

backends/arm/test/misc/test_tosa_dialect_dw_conv2d.py

@@ -4,7 +4,7 @@
 # LICENSE file in the root directory of this source tree.
 
 
-import executorch.backends.arm.tosa.dialect  # noqa: unused
+import executorch.backends.arm.tosa.dialect  # noqa: F401
 import pytest
 import torch
 from executorch.backends.arm.tosa.dialect.lib import TosaValueError

backends/arm/tosa/compile_spec.py

@@ -4,9 +4,6 @@
 # LICENSE file in the root directory of this source tree.
 
 from executorch.backends.arm.common.arm_compile_spec import ArmCompileSpec
-from executorch.backends.arm.common.pipeline_config import (  # noqa: unused
-    ArmPassPipelineConfig,
-)
 from executorch.backends.arm.tosa import TosaSpecification
 
 

backends/arm/vgf/compile_spec.py

@@ -6,9 +6,6 @@
 import logging
 
 from executorch.backends.arm.common.arm_compile_spec import ArmCompileSpec
-from executorch.backends.arm.common.pipeline_config import (  # noqa: unused
-    ArmPassPipelineConfig,
-)
 from executorch.backends.arm.tosa import (  # type: ignore[import-not-found]
     TosaSpecification,
 )