Arm backend: More lintrunner fixes

Author: SaoirseARM

backends/arm/operators/op_maximum.py

@@ -111,7 +111,7 @@ def define_node(
     ) -> None:
 
         import serializer.tosa_serializer as ts  # type: ignore
-        from tosa import NanPropagationMode  # type: ignore[import-untyped]
+        from tosa.NanPropagationMode import NanPropagationMode  # type: ignore
 
         if inputs[0].dtype != inputs[1].dtype and inputs[0].dtype != output.dtype:
             raise TypeError(

backends/arm/operators/op_minimum.py

@@ -109,7 +109,7 @@ def define_node(
     ) -> None:
 
         import serializer.tosa_serializer as ts  # type: ignore
-        from tosa import NanPropagationMode  # type: ignore[import-untyped]
+        from tosa.NanPropagationMode import NanPropagationMode  # type: ignore
 
         if inputs[0].dtype != inputs[1].dtype and inputs[0].dtype != output.dtype:
             raise TypeError(